YEAR MONTH MONTHLY_MEAN_SURF_C MONTHLY_MEAN_BOT_C 1916 8 19.3 NaN 1916 9 18.1 NaN 1916 10 15.7 NaN 1916 11 14.2 NaN 1916 12 13.1 NaN 1917 1 11.8 NaN 1917 2 12.7 NaN 1917 3 13.6 NaN 1917 4 14.8 NaN 1917 5 16.3 NaN 1917 6 18.8 NaN 1917 7 21.4 NaN 1917 8 21.5 NaN 1917 9 19.6 NaN 1917 10 18.0 NaN 1917 11 16.3 NaN 1917 12 15.5 NaN 1918 1 13.9 NaN 1918 2 13.2 NaN 1918 3 14.2 NaN 1918 4 15.1 NaN 1918 5 17.4 NaN 1918 6 19.9 NaN 1918 7 21.0 NaN 1918 8 21.6 NaN 1918 9 20.0 NaN 1918 10 19.6 NaN 1918 11 17.3 NaN 1918 12 15.0 NaN 1919 1 14.5 NaN 1919 2 14.0 NaN 1919 3 13.7 NaN 1919 4 15.9 NaN 1919 5 17.4 NaN 1919 6 18.6 NaN 1919 7 21.1 NaN 1919 8 20.3 NaN 1919 9 18.4 NaN 1919 10 18.2 NaN 1919 11 16.0 NaN 1919 12 14.5 NaN 1920 1 13.8 NaN 1920 2 14.1 NaN 1920 3 14.4 NaN 1920 4 14.8 NaN 1920 5 16.3 NaN 1920 6 19.6 NaN 1920 7 19.1 NaN 1920 8 21.2 NaN 1920 9 19.0 NaN 1920 10 17.1 NaN 1920 11 15.3 NaN 1920 12 13.9 NaN 1921 1 13.3 NaN 1921 2 13.1 NaN 1921 3 14.3 NaN 1921 4 14.2 NaN 1921 5 16.5 NaN 1921 6 18.6 NaN 1921 7 21.4 NaN 1921 8 19.8 NaN 1921 9 18.9 NaN 1921 10 17.5 NaN 1921 11 16.6 NaN 1921 12 14.6 NaN 1922 1 13.6 NaN 1922 2 13.3 NaN 1922 3 13.4 NaN 1922 4 14.0 NaN 1922 5 16.3 NaN 1922 6 18.8 NaN 1922 7 20.6 NaN 1922 8 21.2 NaN 1922 9 19.8 NaN 1922 10 16.6 NaN 1922 11 15.0 NaN 1922 12 15.1 NaN 1923 1 14.3 NaN 1923 2 13.5 NaN 1923 3 14.3 NaN 1923 4 16.1 NaN 1923 5 17.0 NaN 1923 6 18.5 NaN 1923 7 20.2 NaN 1923 8 21.8 NaN 1923 9 20.7 NaN 1923 10 19.0 NaN 1923 11 17.7 NaN 1923 12 15.3 NaN 1924 1 14.6 NaN 1924 2 15.1 NaN 1924 3 15.0 NaN 1924 4 15.6 NaN 1924 5 17.9 NaN 1924 6 18.5 NaN 1924 7 19.4 NaN 1924 8 20.2 NaN 1924 9 17.7 NaN 1924 10 16.4 NaN 1924 11 14.4 NaN 1924 12 13.7 NaN 1925 1 13.4 NaN 1925 2 13.6 NaN 1925 3 14.6 NaN 1925 4 15.1 NaN 1925 5 17.0 NaN 1925 6 19.0 NaN 1925 7 21.1 NaN 1925 8 21.1 NaN 1925 9 18.7 NaN 1925 10 17.7 NaN 1925 11 16.5 NaN 1925 12 16.4 NaN 1926 1 15.7 NaN 1926 2 16.2 NaN 1926 3 17.2 NaN 1926 4 18.3 NaN 1926 5 19.0 NaN 1926 6 20.5 NaN 1926 7 20.4 21.4 1926 8 20.9 18.8 1926 9 18.8 17.6 1926 10 17.7 16.7 1926 11 16.8 16.5 1926 12 15.4 15.3 1927 1 14.3 14.1 1927 2 14.2 14.0 1927 3 14.2 14.0 1927 4 14.8 14.2 1927 5 16.2 14.9 1927 6 18.1 16.8 1927 7 20.0 17.4 1927 8 20.2 17.7 1927 9 19.6 17.8 1927 10 17.9 17.2 1927 11 17.5 17.2 1927 12 15.3 15.2 1928 1 14.8 14.7 1928 2 14.3 14.2 1928 3 15.1 14.7 1928 4 15.1 14.4 1928 5 17.4 16.9 1928 6 18.5 17.8 1928 7 19.7 17.9 1928 8 20.1 18.5 1928 9 18.1 17.8 1928 10 17.3 17.0 1928 11 15.7 15.6 1928 12 14.6 14.5 1929 1 13.9 13.8 1929 2 13.2 13.1 1929 3 13.7 13.5 1929 4 14.5 14.2 1929 5 17.6 17.1 1929 6 18.7 17.9 1929 7 21.3 19.8 1929 8 21.9 19.2 1929 9 20.1 19.1 1929 10 18.5 17.7 1929 11 16.8 16.4 1929 12 16.0 15.8 1930 1 14.6 14.5 1930 2 14.8 14.5 1930 3 14.9 14.6 1930 4 16.6 16.1 1930 5 17.2 16.6 1930 6 18.7 17.8 1930 7 19.4 17.6 1930 8 21.6 20.1 1930 9 19.7 18.2 1930 10 18.1 17.8 1930 11 17.5 17.3 1930 12 16.2 16.1 1931 1 15.5 15.4 1931 2 16.1 15.9 1931 3 16.8 16.5 1931 4 18.0 17.8 1931 5 19.0 17.7 1931 6 20.0 19.0 1931 7 23.6 22.0 1931 8 23.3 21.4 1931 9 20.2 18.2 1931 10 18.8 17.6 1931 11 16.5 16.4 1931 12 14.1 14.0 1932 1 13.3 13.4 1932 2 13.3 13.6 1932 3 14.8 14.4 1932 4 14.8 14.1 1932 5 16.1 15.2 1932 6 19.0 17.5 1932 7 19.5 18.0 1932 8 18.7 17.1 1932 9 18.6 17.2 1932 10 17.4 16.6 1932 11 16.2 15.8 1932 12 14.0 13.9 1933 1 13.0 12.8 1933 2 12.6 12.5 1933 3 13.5 13.0 1933 4 14.9 14.5 1933 5 15.4 15.0 1933 6 17.3 15.6 1933 7 18.7 16.7 1933 8 19.1 16.0 1933 9 17.0 15.3 1933 10 17.2 16.0 1933 11 15.4 14.8 1933 12 13.9 13.8 1934 1 13.3 13.2 1934 2 14.0 13.8 1934 3 15.7 15.1 1934 4 17.3 16.6 1934 5 19.2 18.4 1934 6 19.1 18.4 1934 7 20.5 19.3 1934 8 20.5 18.0 1934 9 20.5 19.5 1934 10 17.9 17.0 1934 11 17.0 16.7 1934 12 15.5 15.4 1935 1 14.4 14.3 1935 2 14.0 13.9 1935 3 13.3 12.9 1935 4 15.0 14.2 1935 5 17.6 16.6 1935 6 18.9 18.0 1935 7 20.0 17.4 1935 8 20.7 17.8 1935 9 19.4 16.8 1935 10 17.2 16.1 1935 11 15.3 15.0 1935 12 14.7 14.7 1936 1 14.0 13.9 1936 2 14.6 14.6 1936 3 15.1 14.9 1936 4 14.2 13.7 1936 5 18.1 17.4 1936 6 18.0 16.4 1936 7 22.3 19.2 1936 8 22.1 20.0 1936 9 21.0 19.4 1936 10 18.6 18.0 1936 11 17.3 17.1 1936 12 16.1 16.0 1937 1 13.4 13.3 1937 2 13.1 13.1 1937 3 14.2 14.0 1937 4 14.9 14.2 1937 5 17.7 17.5 1937 6 19.1 18.7 1937 7 20.8 18.7 1937 8 20.6 18.7 1937 9 20.6 19.5 1937 10 17.7 16.8 1937 11 17.0 16.8 1937 12 15.3 15.2 1938 1 15.0 14.9 1938 2 14.4 14.3 1938 3 14.6 14.5 1938 4 15.1 14.6 1938 5 16.7 15.4 1938 6 17.9 16.4 1938 7 19.1 16.5 1938 8 21.0 18.9 1938 9 20.1 NaN 1938 10 17.1 15.7 1938 11 14.5 14.2 1938 12 14.8 14.7 1939 1 14.1 14.1 1939 2 12.0 11.9 1939 3 13.2 13.1 1939 4 15.5 14.7 1939 5 16.7 15.2 1939 6 18.4 17.3 1939 7 20.7 18.9 1939 8 21.3 19.5 1939 9 19.4 17.7 1939 10 19.2 19.0 1939 11 18.2 18.0 1939 12 17.4 17.3 1940 1 15.8 15.8 1940 2 15.2 15.1 1940 3 15.0 14.9 1940 4 16.5 16.3 1940 5 18.6 18.3 1940 6 18.2 17.3 1940 7 18.3 16.5 1940 8 20.6 18.4 1940 9 19.2 18.5 1940 10 18.6 17.6 1940 11 16.0 15.7 1940 12 16.1 16.1 1941 1 15.7 15.7 1941 2 15.7 15.7 1941 3 16.8 16.8 1941 4 17.0 16.8 1941 5 18.0 16.9 1941 6 18.9 17.2 1941 7 18.9 17.2 1941 8 20.0 18.1 1941 9 19.3 17.8 1941 10 18.5 18.4 1941 11 17.4 17.3 1941 12 15.7 15.8 1942 1 14.4 14.4 1942 2 13.9 14.0 1942 3 14.3 14.3 1942 4 15.5 15.3 1942 5 16.9 16.5 1942 6 18.7 18.4 1942 7 20.2 18.4 1942 8 20.6 19.3 1942 9 18.8 17.7 1942 10 19.1 18.9 1942 11 16.8 16.9 1942 12 15.0 15.0 1943 1 14.1 14.2 1943 2 14.5 14.6 1943 3 15.7 15.4 1943 4 14.9 14.1 1943 5 17.4 16.1 1943 6 18.3 17.2 1943 7 18.0 15.8 1943 8 21.9 20.4 1943 9 18.8 17.4 1943 10 18.2 17.5 1943 11 16.6 16.6 1943 12 15.6 15.8 1944 1 14.2 14.3 1944 2 13.8 13.9 1944 3 14.5 14.5 1944 4 15.3 15.1 1944 5 16.3 15.8 1944 6 18.1 17.6 1944 7 18.1 16.8 1944 8 19.5 18.1 1944 9 19.1 18.4 1944 10 17.8 17.2 1944 11 16.4 16.5 1944 12 14.7 14.8 1945 1 14.2 14.2 1945 2 14.0 14.0 1945 3 13.1 13.1 1945 4 13.8 13.2 1945 5 15.9 14.6 1945 6 18.6 18.1 1945 7 20.0 18.7 1945 8 21.4 20.2 1945 9 20.3 19.0 1945 10 18.5 18.0 1945 11 15.2 14.9 1945 12 14.3 14.3 1946 1 13.0 13.1 1946 2 12.8 12.9 1946 3 13.6 13.6 1946 4 16.2 15.7 1946 5 17.6 17.2 1946 6 19.6 19.2 1946 7 20.4 19.1 1946 8 21.2 18.7 1946 9 18.9 17.0 1946 10 18.5 18.1 1946 11 15.7 15.7 1946 12 14.4 14.5 1947 1 13.4 13.6 1947 2 13.9 13.8 1947 3 14.9 14.9 1947 4 15.8 15.4 1947 5 18.0 17.8 1947 6 19.1 18.4 1947 7 19.3 17.3 1947 8 20.0 18.3 1947 9 19.6 17.8 1947 10 18.8 18.0 1947 11 15.8 15.7 1947 12 14.1 14.2 1948 1 13.6 13.6 1948 2 13.1 13.2 1948 3 13.4 13.4 1948 4 14.8 14.5 1948 5 16.9 16.6 1948 6 17.3 16.2 1948 7 18.5 17.1 1948 8 19.9 18.5 1948 9 19.3 18.1 1948 10 16.9 16.6 1948 11 15.6 15.6 1948 12 13.7 13.9 1949 1 12.3 12.5 1949 2 12.7 12.8 1949 3 13.4 13.4 1949 4 14.4 14.1 1949 5 17.4 17.0 1949 6 19.5 18.7 1949 7 20.2 18.4 1949 8 20.9 20.1 1949 9 20.2 19.0 1949 10 17.4 16.7 1949 11 15.8 15.8 1949 12 14.2 14.3 1950 1 12.8 12.9 1950 2 13.0 13.0 1950 3 13.9 13.8 1950 4 15.7 15.5 1950 5 15.7 15.1 1950 6 17.5 17.1 1950 7 20.5 19.4 1950 8 19.1 18.1 1950 9 19.3 18.8 1950 10 18.1 17.1 1950 11 16.4 16.2 1950 12 14.9 14.7 1951 1 13.2 13.1 1951 2 13.5 13.2 1951 3 14.0 13.7 1951 4 16.0 15.7 1951 5 16.7 15.6 1951 6 18.6 17.9 1951 7 20.1 18.5 1951 8 19.7 17.7 1951 9 17.8 16.7 1951 10 18.3 17.2 1951 11 16.7 16.5 1951 12 14.9 14.7 1952 1 13.7 13.7 1952 2 13.6 13.5 1952 3 13.5 13.2 1952 4 15.4 14.6 1952 5 17.2 16.1 1952 6 17.5 15.6 1952 7 18.1 15.3 1952 8 20.9 18.6 1952 9 18.1 16.3 1952 10 17.3 16.3 1952 11 15.4 15.2 1952 12 14.7 14.6 1953 1 14.0 14.0 1953 2 13.2 13.1 1953 3 13.7 13.5 1953 4 14.6 14.3 1953 5 15.8 15.3 1953 6 17.1 16.4 1953 7 20.6 19.5 1953 8 20.7 19.2 1953 9 17.6 16.9 1953 10 17.6 17.2 1953 11 15.9 15.8 1953 12 14.3 14.2 1954 1 14.1 14.1 1954 2 14.3 14.2 1954 3 14.0 13.9 1954 4 15.1 14.5 1954 5 16.6 16.1 1954 6 18.4 17.9 1954 7 21.2 20.5 1954 8 21.3 20.7 1954 9 19.1 18.5 1954 10 16.8 16.5 1954 11 16.4 16.3 1954 12 15.0 14.9 1955 1 13.4 13.7 1955 2 13.0 NaN 1955 3 14.4 NaN 1955 4 14.1 NaN 1955 5 16.4 17.2 1955 6 18.1 17.5 1955 7 19.6 18.2 1955 8 21.5 19.3 1955 9 20.6 19.0 1955 10 17.3 17.0 1955 11 15.7 15.6 1955 12 13.8 13.7 1956 1 12.6 12.5 1956 2 12.9 12.9 1956 3 13.4 13.3 1956 4 14.8 14.4 1956 5 16.3 15.8 1956 6 17.4 16.6 1956 7 20.0 18.6 1956 8 21.1 20.1 1956 9 18.8 17.8 1956 10 18.3 17.7 1956 11 15.5 15.4 1956 12 15.4 15.4 1957 1 14.8 14.8 1957 2 14.4 14.2 1957 3 14.8 14.6 1957 4 15.3 14.7 1957 5 16.8 16.3 1957 6 19.4 19.0 1957 7 20.9 19.7 1957 8 21.5 19.9 1957 9 19.2 18.0 1957 10 18.1 17.5 1957 11 16.8 16.8 1957 12 16.5 16.5 1958 1 16.1 16.1 1958 2 16.0 16.0 1958 3 15.4 15.3 1958 4 17.1 17.0 1958 5 17.2 16.4 1958 6 18.3 17.3 1958 7 19.4 16.7 1958 8 20.5 18.6 1958 9 20.2 19.2 1958 10 19.7 19.2 1958 11 17.8 17.7 1958 12 16.5 16.4 1959 1 16.0 15.9 1959 2 15.2 15.1 1959 3 16.2 16.1 1959 4 17.1 16.7 1959 5 18.4 18.3 1959 6 19.9 19.0 1959 7 22.0 19.6 1959 8 21.3 18.9 1959 9 21.0 20.3 1959 10 19.5 19.2 1959 11 17.6 17.3 1959 12 16.2 16.1 1960 1 14.3 14.2 1960 2 13.5 13.4 1960 3 14.3 14.2 1960 4 16.2 15.9 1960 5 17.8 17.5 1960 6 17.5 15.9 1960 7 18.8 16.8 1960 8 19.5 17.1 1960 9 19.1 17.2 1960 10 17.8 17.1 1960 11 16.4 16.2 1960 12 14.2 14.2 1961 1 14.6 14.6 1961 2 14.5 14.4 1961 3 14.6 14.4 1961 4 15.6 15.0 1961 5 16.2 15.8 1961 6 17.1 16.0 1961 7 20.5 19.5 1961 8 19.8 17.2 1961 9 19.0 18.0 1961 10 17.2 16.2 1961 11 14.9 14.6 1961 12 14.3 14.2 1962 1 13.4 13.3 1962 2 13.6 13.8 1962 3 13.4 13.4 1962 4 15.3 14.8 1962 5 16.2 15.5 1962 6 16.9 16.4 1962 7 18.3 16.6 1962 8 20.0 18.7 1962 9 19.3 18.3 1962 10 17.6 17.0 1962 11 16.0 15.9 1962 12 14.8 14.7 1963 1 14.0 14.0 1963 2 14.8 14.8 1963 3 14.5 14.4 1963 4 14.6 14.3 1963 5 16.4 15.5 1963 6 18.3 18.0 1963 7 19.4 18.0 1963 8 21.0 19.9 1963 9 19.6 18.5 1963 10 18.6 18.0 1963 11 16.7 16.6 1963 12 15.7 15.7 1964 1 15.4 15.3 1964 2 14.6 14.6 1964 3 14.3 14.2 1964 4 15.0 14.8 1964 5 15.0 14.2 1964 6 17.0 16.8 1964 7 19.4 17.5 1964 8 21.6 20.8 1964 9 19.1 18.6 1964 10 17.7 16.7 1964 11 14.8 14.6 1964 12 13.4 13.5 1965 1 13.1 13.1 1965 2 13.4 13.4 1965 3 14.5 14.4 1965 4 15.8 15.5 1965 5 17.5 17.4 1965 6 16.9 16.3 1965 7 17.2 15.7 1965 8 20.7 19.6 1965 9 18.9 18.1 1965 10 18.1 17.6 1965 11 16.9 16.8 1965 12 15.4 15.5 1966 1 13.8 13.8 1966 2 13.7 13.7 1966 3 14.0 14.0 1966 4 16.2 16.0 1966 5 17.5 17.3 1966 6 18.9 18.4 1966 7 19.4 18.2 1966 8 22.3 20.7 1966 9 18.7 17.3 1966 10 18.2 17.7 1966 11 16.7 16.4 1966 12 14.7 14.6 1967 1 13.8 13.8 1967 2 14.1 14.1 1967 3 15.0 15.0 1967 4 14.4 14.4 1967 5 15.6 15.1 1967 6 17.2 16.5 1967 7 20.0 18.8 1967 8 22.1 21.3 1967 9 20.6 19.5 1967 10 18.5 17.8 1967 11 17.8 17.5 1967 12 14.2 14.2 1968 1 14.1 14.1 1968 2 14.8 14.8 1968 3 15.2 15.1 1968 4 16.1 15.9 1968 5 16.0 15.4 1968 6 18.7 18.3 1968 7 20.2 19.5 1968 8 20.3 18.8 1968 9 20.1 18.9 1968 10 17.6 16.9 1968 11 16.2 16.1 1968 12 14.1 14.1 1969 1 14.5 14.6 1969 2 14.1 14.1 1969 3 14.0 13.9 1969 4 14.9 14.8 1969 5 16.5 15.9 1969 6 18.1 17.9 1969 7 18.9 18.0 1969 8 20.3 18.9 1969 9 18.3 17.2 1969 10 18.0 17.8 1969 11 16.6 16.7 1969 12 15.6 15.7 1970 1 13.4 13.5 1970 2 13.8 13.9 1970 3 15.2 15.2 1970 4 15.2 14.8 1970 5 16.1 15.8 1970 6 18.1 17.7 1970 7 19.2 17.0 1970 8 20.6 18.6 1970 9 18.7 16.7 1970 10 18.3 17.7 1970 11 16.4 16.3 1970 12 14.6 14.6 1971 1 12.9 13.3 1971 2 13.3 13.3 1971 3 12.7 12.5 1971 4 14.2 14.4 1971 5 15.5 15.4 1971 6 18.4 17.4 1971 7 20.9 19.4 1971 8 22.7 20.9 1971 9 19.1 18.1 1971 10 17.1 16.8 1971 11 14.8 14.6 1971 12 12.6 12.6 1972 1 12.6 12.6 1972 2 13.0 13.0 1972 3 14.5 14.4 1972 4 14.8 14.3 1972 5 17.1 16.3 1972 6 19.6 18.7 1972 7 19.8 18.5 1972 8 20.9 19.3 1972 9 19.7 19.1 1972 10 18.1 17.6 1972 11 16.4 16.2 1972 12 15.9 16.1 1973 1 15.0 15.2 1973 2 15.0 15.1 1973 3 14.9 15.0 1973 4 14.7 14.5 1973 5 16.3 16.0 1973 6 18.4 17.7 1973 7 19.1 18.1 1973 8 20.0 19.2 1973 9 18.7 18.1 1973 10 16.5 15.5 1973 11 15.1 14.9 1973 12 13.7 13.7 1974 1 13.1 13.0 1974 2 13.1 13.0 1974 3 14.0 13.9 1974 4 14.7 14.6 1974 5 16.8 16.3 1974 6 17.5 16.1 1974 7 20.1 18.8 1974 8 20.4 18.5 1974 9 20.2 18.8 1974 10 18.5 17.8 1974 11 15.6 15.5 1974 12 13.8 13.6 1975 1 13.1 13.0 1975 2 13.2 13.2 1975 3 13.3 13.2 1975 4 13.9 13.9 1975 5 14.9 14.8 1975 6 16.7 16.3 1975 7 19.9 19.5 1975 8 18.1 16.6 1975 9 18.3 17.7 1975 10 16.9 16.3 1975 11 14.5 14.2 1975 12 13.6 13.5 1976 1 13.5 13.4 1976 2 14.2 14.2 1976 3 14.3 14.2 1976 4 14.3 14.1 1976 5 17.1 16.9 1976 6 19.0 18.1 1976 7 20.3 19.9 1976 8 19.1 18.5 1976 9 20.2 19.6 1976 10 19.6 19.2 1976 11 18.3 18.2 1976 12 17.3 17.3 1977 1 16.2 16.2 1977 2 15.7 15.8 1977 3 13.8 13.7 1977 4 15.6 15.6 1977 5 16.6 16.5 1977 6 17.7 17.2 1977 7 19.4 18.5 1977 8 20.4 19.6 1977 9 19.8 19.0 1977 10 18.0 17.5 1977 11 17.4 17.3 1977 12 16.3 16.2 1978 1 15.9 15.9 1978 2 15.4 15.5 1978 3 16.2 16.2 1978 4 16.5 16.5 1978 5 17.6 17.1 1978 6 18.3 17.7 1978 7 18.9 17.7 1978 8 20.6 19.6 1978 9 20.4 19.8 1978 10 18.7 17.9 1978 11 16.9 17.0 1978 12 13.8 13.8 1979 1 14.1 14.3 1979 2 13.6 13.7 1979 3 14.4 14.2 1979 4 15.6 14.8 1979 5 15.9 15.5 1979 6 18.8 18.2 1979 7 19.4 18.4 1979 8 21.3 19.7 1979 9 21.0 19.3 1979 10 17.6 16.6 1979 11 15.6 15.3 1979 12 14.7 14.6 1980 1 14.6 14.6 1980 2 15.3 15.2 1980 3 15.9 15.8 1980 4 15.5 15.2 1980 5 16.4 16.3 1980 6 16.7 15.8 1980 7 17.6 16.8 1980 8 21.5 20.8 1980 9 19.3 18.8 1980 10 16.9 16.7 1980 11 15.3 15.2 1980 12 14.5 14.5 1981 1 14.7 14.7 1981 2 14.6 14.6 1981 3 15.3 15.3 1981 4 16.1 15.9 1981 5 18.5 18.4 1981 6 21.1 20.6 1981 7 21.0 19.4 1981 8 21.4 20.2 1981 9 19.8 18.2 1981 10 18.0 17.2 1981 11 16.2 16.1 1981 12 14.7 14.6 1982 1 13.8 13.8 1982 2 14.3 14.3 1982 3 14.9 14.9 1982 4 15.6 15.2 1982 5 17.2 16.9 1982 6 17.3 17.0 1982 7 20.2 19.5 1982 8 21.3 20.2 1982 9 20.3 19.7 1982 10 18.4 18.2 1982 11 16.7 16.7 1982 12 15.4 15.5 1983 1 15.7 15.8 1983 2 16.0 15.9 1983 3 16.3 16.3 1983 4 15.9 15.7 1983 5 17.0 16.5 1983 6 18.1 18.1 1983 7 20.4 19.8 1983 8 21.3 20.6 1983 9 21.1 20.4 1983 10 20.2 20.0 1983 11 17.9 17.9 1983 12 15.7 15.7 1984 1 15.2 15.2 1984 2 14.8 14.9 1984 3 15.5 15.5 1984 4 16.2 16.1 1984 5 18.3 18.0 1984 6 20.5 20.0 1984 7 22.2 19.4 1984 8 23.2 20.9 1984 9 23.2 21.7 1984 10 19.6 19.2 1984 11 16.8 16.6 1984 12 14.3 14.3 1985 1 13.9 13.9 1985 2 13.7 13.7 1985 3 14.0 13.7 1985 4 15.9 15.5 1985 5 17.0 16.2 1985 6 18.6 17.4 1985 7 20.5 19.6 1985 8 21.9 20.9 1985 9 20.4 19.2 1985 10 19.4 18.6 1985 11 16.6 16.4 1985 12 14.6 14.5 1986 1 14.9 14.8 1986 2 15.4 15.2 1986 3 15.8 15.5 1986 4 16.7 16.2 1986 5 18.0 17.7 1986 6 19.7 19.5 1986 7 20.0 18.4 1986 8 19.7 17.7 1986 9 19.6 18.2 1986 10 18.6 18.5 1986 11 17.6 17.6 1986 12 16.6 16.8 1987 1 14.9 14.9 1987 2 15.1 15.1 1987 3 14.9 14.9 1987 4 17.4 17.4 1987 5 18.6 18.7 1987 6 18.2 17.8 1987 7 18.6 18.0 1987 8 19.9 19.3 1987 9 20.7 20.4 1987 10 19.9 19.5 1987 11 17.5 17.6 1987 12 15.0 15.1 1988 1 13.7 13.9 1988 2 14.2 14.2 1988 3 15.5 15.6 1988 4 16.8 16.5 1988 5 17.0 16.5 1988 6 17.9 17.0 1988 7 20.9 19.4 1988 8 20.7 18.2 1988 9 19.5 18.2 1988 10 18.5 18.0 1988 11 15.3 15.2 1988 12 13.7 13.8 1989 1 12.8 12.8 1989 2 13.1 13.1 1989 3 14.6 14.5 1989 4 17.6 16.9 1989 5 17.5 16.6 1989 6 18.3 18.1 1989 7 20.1 19.0 1989 8 21.0 19.1 1989 9 19.3 18.4 1989 10 18.9 18.3 1989 11 17.1 17.2 1989 12 15.8 15.9 1990 1 15.0 15.0 1990 2 13.8 13.7 1990 3 14.4 14.2 1990 4 16.7 16.4 1990 5 18.5 18.3 1990 6 18.9 18.1 1990 7 22.0 19.9 1990 8 22.2 20.6 1990 9 20.6 19.3 1990 10 19.9 19.5 1990 11 17.2 17.0 1990 12 15.4 15.2 1991 1 14.7 14.7 1991 2 15.0 14.9 1991 3 14.6 14.5 1991 4 16.2 16.0 1991 5 16.1 15.3 1991 6 18.4 17.6 1991 7 19.4 18.2 1991 8 19.5 18.2 1991 9 19.4 18.3 1991 10 18.8 18.1 1991 11 16.4 16.3 1991 12 14.9 14.9 1992 1 14.9 14.8 1992 2 15.7 15.6 1992 3 16.5 16.3 1992 4 19.0 18.5 1992 5 19.3 18.6 1992 6 18.3 16.5 1992 7 19.6 18.2 1992 8 22.5 21.1 1992 9 19.6 18.5 1992 10 19.4 19.0 1992 11 18.3 18.1 1992 12 15.8 15.7 1993 1 15.2 15.2 1993 2 15.7 15.6 1993 3 16.2 16.1 1993 4 17.1 17.2 1993 5 18.3 17.9 1993 6 19.9 19.2 1993 7 21.7 21.2 1993 8 21.6 20.8 1993 9 20.1 19.0 1993 10 19.7 19.6 1993 11 17.7 17.6 1993 12 16.0 15.9 1994 1 15.4 15.3 1994 2 14.9 14.8 1994 3 16.1 15.9 1994 4 16.8 16.6 1994 5 17.3 17.0 1994 6 19.8 18.7 1994 7 21.5 20.1 1994 8 22.3 20.9 1994 9 21.2 19.9 1994 10 19.7 19.4 1994 11 16.1 15.9 1994 12 14.9 14.9 1995 1 14.9 14.8 1995 2 16.0 15.8 1995 3 16.7 16.4 1995 4 16.2 15.9 1995 5 16.9 16.5 1995 6 18.6 18.2 1995 7 19.5 18.1 1995 8 21.0 20.4 1995 9 19.8 18.8 1995 10 19.5 19.2 1995 11 18.2 18.0 1995 12 16.4 16.3 1996 1 14.9 14.9 1996 2 14.9 14.7 1996 3 15.9 15.6 1996 4 17.6 17.3 1996 5 19.6 19.0 1996 6 21.2 20.7 1996 7 19.1 17.7 1996 8 21.3 20.4 1996 9 21.5 20.6 1996 10 18.3 17.7 1996 11 16.8 16.6 1996 12 15.0 15.0 1997 1 14.9 14.6 1997 2 15.1 15.0 1997 3 15.9 15.6 1997 4 17.7 17.4 1997 5 20.6 20.2 1997 6 21.4 21.1 1997 7 21.8 21.1 1997 8 21.7 20.7 1997 9 22.6 21.5 1997 10 21.0 20.9 1997 11 19.8 19.7 1997 12 17.3 17.2 1998 1 17.6 17.5 1998 2 16.8 16.6 1998 3 16.8 16.7 1998 4 16.3 16.2 1998 5 18.1 17.6 1998 6 19.3 18.9 1998 7 21.1 20.7 1998 8 21.5 20.2 1998 9 20.1 19.3 1998 10 19.2 18.9 1998 11 16.7 16.4 1998 12 14.4 14.2 1999 1 14.4 14.4 1999 2 13.9 13.9 1999 3 14.3 14.0 1999 4 14.6 14.3 1999 5 16.8 16.5 1999 6 17.5 17.0 1999 7 20.5 19.2 1999 8 19.5 17.6 1999 9 17.7 16.8 1999 10 17.9 16.9 1999 11 16.5 16.1 1999 12 14.6 14.5 2000 1 14.8 14.7 2000 2 15.0 14.9 2000 3 15.1 15.0 2000 4 16.2 15.9 2000 5 17.6 17.0 2000 6 20.2 19.3 2000 7 21.2 19.1 2000 8 21.5 19.7 2000 9 20.6 19.4 2000 10 18.7 17.6 2000 11 16.2 16.0 2000 12 15.2 15.0 2001 1 14.7 14.6 2001 2 13.8 13.7 2001 3 15.1 14.9 2001 4 15.7 15.5 2001 5 17.9 17.5 2001 6 20.2 18.7 2001 7 19.5 17.7 2001 8 22.0 21.6 2001 9 20.3 19.6 2001 10 18.6 18.2 2001 11 16.1 15.9 2001 12 14.4 14.3 2002 1 14.5 14.4 2002 2 14.7 14.6 2002 3 14.6 14.2 2002 4 15.6 14.6 2002 5 17.1 16.7 2002 6 19.4 19.0 2002 7 20.9 20.1 2002 8 21.2 19.5 2002 9 20.3 18.8 2002 10 17.9 17.0 2002 11 16.9 16.6 2002 12 15.7 15.6 2003 1 15.5 15.4 2003 2 15.7 15.6 2003 3 15.8 15.4 2003 4 15.7 15.0 2003 5 16.8 16.2 2003 6 18.5 17.7 2003 7 20.8 19.2 2003 8 21.1 17.5 2003 9 20.7 18.1 2003 10 19.2 18.0 2003 11 17.0 16.7 2003 12 15.3 15.2 2004 1 14.5 14.4 2004 2 14.4 14.3 2004 3 15.7 15.5 2004 4 17.3 17.1 2004 5 19.5 19.3 2004 6 20.3 20.0 2004 7 20.9 19.8 2004 8 22.0 20.3 2004 9 22.5 22.1 2004 10 19.6 19.4 2004 11 17.4 17.4 2004 12 15.8 15.9 2005 1 15.8 15.6 2005 2 15.8 15.6 2005 3 16.9 16.7 2005 4 16.4 16.4 2005 5 19.1 18.7 2005 6 19.8 19.0 2005 7 21.6 20.6 2005 8 21.7 20.1 2005 9 19.8 18.7 2005 10 18.9 18.4 2005 11 17.7 17.2 2005 12 15.7 15.5 2006 1 15.0 15.0 2006 2 15.1 14.8 2006 3 14.1 13.8 2006 4 15.9 15.4 2006 5 17.7 16.9 2006 6 20.8 19.6 2006 7 23.2 20.9 2006 8 22.5 21.0 2006 9 20.5 18.7 2006 10 18.6 17.9 2006 11 17.9 17.6 2006 12 16.0 15.9 2007 1 14.7 14.6 2007 2 15.0 15.0 2007 3 15.4 15.0 2007 4 15.9 15.7 2007 5 17.2 17.0 2007 6 19.5 18.7 2007 7 21.2 19.5 2007 8 23.2 21.7 2007 9 20.0 18.8 2007 10 18.3 17.8 2007 11 16.8 16.6 2007 12 14.9 14.8 2008 1 13.9 13.7 2008 2 14.2 14.1 2008 3 15.4 14.8 2008 4 16.1 15.4 2008 5 18.3 18.0 2008 6 19.6 18.7 2008 7 21.0 19.6 2008 8 22.0 20.5 2008 9 20.5 19.4 2008 10 18.8 17.8 2008 11 17.8 17.6 2008 12 15.4 15.3 2009 1 14.8 14.7 2009 2 14.6 14.6 2009 3 15.1 14.8 2009 4 16.1 15.3 2009 5 18.6 18.3 2009 6 19.6 18.3 2009 7 21.0 18.8 2009 8 22.8 21.4 2009 9 22.5 20.7 2009 10 19.2 18.6 2009 11 17.3 17.1 2009 12 15.6 15.5 2010 1 15.5 15.4 2010 2 15.7 15.6 2010 3 15.8 15.6 2010 4 16.2 16.1 2010 5 17.2 16.2 2010 6 19.5 19.3 2010 7 18.9 17.5 2010 8 19.2 16.5 2010 9 18.1 16.5 2010 10 19.1 18.6 2010 11 16.9 16.5 2010 12 14.5 14.4 2011 1 14.8 14.6 2011 2 14.5 14.3 2011 3 14.6 14.1 2011 4 16.5 16.0 2011 5 17.5 16.9 2011 6 18.1 16.9 2011 7 20.9 19.2 2011 8 19.5 18.0 2011 9 18.7 17.5 2011 10 17.7 17.0 2011 11 16.2 15.9 2011 12 14.7 14.6 2012 1 14.8 14.8 2012 2 14.9 14.8