Year N S (N+S)/2 (N-S)/(N+S) 1854 10.37 9.50 9.93 0.0438 1855 7.31 8.46 7.89 -0.0728 1856 11.36 24.52 17.94 -0.3667 1857 22.50 24.49 23.49 -0.0422 1858 20.80 20.70 20.75 0.0024 1859 17.45 17.19 17.32 0.0075 1860 17.92 16.88 17.40 0.0299 1861 14.34 14.60 14.47 -0.0089 1862 12.86 12.09 12.48 0.0309 1863 10.90 10.54 10.72 0.0168 1864 11.18 10.27 10.73 0.0424 1865 9.37 10.27 9.82 -0.0457 1866 9.47 8.51 8.99 0.0534 1867 12.45 20.99 16.72 -0.2553 1868 25.07 21.96 23.52 0.0661 1869 21.81 21.76 21.79 0.0011 1870 17.08 19.00 18.04 -0.0531 1871 17.92 14.92 16.42 0.0913 1872 16.12 13.32 14.72 0.0951 1873 13.42 11.31 12.37 0.0853 1874 11.11 11.31 11.21 -0.0088 1875 11.56 10.31 10.94 0.0572 1876 11.12 10.49 10.81 0.0292 1877 9.67 9.66 9.66 0.0005 1878 8.18 7.71 7.95 0.0296 1879 20.26 21.58 20.92 -0.0314 1880 20.06 19.76 19.91 0.0075 1881 18.16 19.26 18.71 -0.0293 1882 15.74 14.28 15.01 0.0486 1883 11.30 13.72 12.51 -0.0966 1884 10.63 11.88 11.26 -0.0554 1885 10.43 12.37 11.40 -0.0850 1886 9.97 10.56 10.27 -0.0286 1887 8.70 8.83 8.77 -0.0073 1888 6.55 7.23 6.89 -0.0492 1889 7.26 12.36 9.81 -0.2598 1890 21.98 22.48 22.23 -0.0111 1891 20.21 19.97 20.09 0.0060 1892 15.25 21.01 18.13 -0.1587 1893 14.71 14.82 14.77 -0.0036 1894 12.31 15.56 13.94 -0.1165 1895 14.26 12.54 13.40 0.0642 1896 13.60 14.77 14.18 -0.0411 1897 8.32 7.73 8.03 0.0368 1898 9.82 10.77 10.30 -0.0460 1899 6.18 10.43 8.31 -0.2558 1900 6.61 8.34 7.48 -0.1156 1901 8.59 16.27 12.43 -0.3088 1902 18.81 15.29 17.05 0.1032 1903 18.06 21.15 19.60 -0.0787 1904 16.32 16.89 16.61 -0.0171 1905 11.67 15.55 13.61 -0.1424 1906 13.99 14.01 14.00 -0.0006 1907 10.12 13.77 11.95 -0.1527 1908 10.42 10.34 10.38 0.0039 1909 9.44 9.91 9.68 -0.0242 1910 8.55 11.18 9.87 -0.1332 1911 7.89 5.99 6.94 0.1369 1912 20.53 7.78 14.16 0.4504 1913 24.81 20.08 22.45 0.1054 1914 21.11 23.06 22.09 -0.0440 1915 17.95 19.75 18.85 -0.0476 1916 15.14 17.05 16.10 -0.0592 1917 13.82 15.66 14.74 -0.0623 1918 11.97 13.69 12.83 -0.0669 1919 9.55 11.79 10.67 -0.1049 1920 11.31 9.98 10.65 0.0625 1921 7.27 8.92 8.09 -0.1018 1922 8.82 6.62 7.72 0.1425 1923 13.88 17.32 15.60 -0.1102 1924 22.19 25.54 23.87 -0.0701 1925 20.70 19.37 20.04 0.0332 1926 19.27 17.98 18.63 0.0346 1927 17.75 13.54 15.65 0.1345 1928 11.93 15.23 13.58 -0.1214 1929 10.73 10.27 10.50 0.0219 1930 10.60 8.96 9.78 0.0838 1931 7.91 9.39 8.65 -0.0854 1932 8.22 8.62 8.42 -0.0237 1933 10.60 8.35 9.48 0.1187 1934 16.45 28.09 22.27 -0.2612 1935 22.42 23.72 23.07 -0.0281 1936 19.36 21.02 20.19 -0.0410 1937 17.63 15.96 16.80 0.0497 1938 15.55 14.17 14.86 0.0464 1939 14.64 12.57 13.61 0.0761 1940 11.65 10.72 11.19 0.0416 1941 11.31 8.67 9.99 0.1321 1942 9.32 8.45 8.89 0.0490 1943 9.01 15.87 12.44 -0.2756 1944 19.00 22.81 20.91 -0.0910 1945 20.13 20.26 20.20 -0.0031 1946 20.74 18.79 19.77 0.0493 1947 16.58 17.86 17.22 -0.0371 1948 14.92 13.53 14.23 0.0489 1949 14.30 12.14 13.22 0.0817 1950 13.62 13.05 13.34 0.0214 1951 11.62 10.78 11.20 0.0375 1952 7.60 8.37 7.99 -0.0481 1953 9.90 9.75 9.82 0.0076 1954 28.84 17.20 23.02 0.2528 1955 25.39 22.35 23.87 0.0637 1956 22.39 20.91 21.65 0.0342 1957 18.86 20.81 19.84 -0.0491 1958 19.21 15.26 17.24 0.1146 1959 14.17 13.50 13.84 0.0242 1960 16.11 12.11 14.11 0.1417 1961 12.06 8.47 10.27 0.1749 1962 9.23 5.28 7.26 0.2722 1963 11.04 10.43 10.74 0.0284 1964 17.70 5.32 11.51 0.5378 1965 20.59 17.29 18.94 0.0871 1966 20.27 22.36 21.32 -0.0489 1967 19.53 21.49 20.51 -0.0477 1968 15.40 18.18 16.79 -0.0827 1969 13.33 14.56 13.95 -0.0440 1970 14.92 11.95 13.43 0.1105 1971 11.64 10.59 11.12 0.0472 1972 11.30 11.46 11.38 -0.0069 1973 10.98 10.76 10.87 0.0101 1974 9.96 10.98 10.47 -0.0486 1975 8.27 8.65 8.46 -0.0224 1976 12.74 14.04 13.39 -0.0484 1977 21.95 20.90 21.42 0.0245 1978 20.91 21.16 21.04 -0.0058 1979 17.43 19.38 18.41 -0.0529 1980 14.54 16.68 15.61 -0.0684 1981 12.85 14.65 13.75 -0.0654 1982 11.75 13.28 12.52 -0.0610 1983 11.02 13.13 12.08 -0.0873 1984 8.89 11.62 10.26 -0.1330 1985 6.41 10.51 8.46 -0.2422