Year N S N+S (N-S)/(N+S) 1837 0.0 0.0 0.0 - 1838 2.0 2.0 4.0 - 1839 5.0 5.0 10.0 - 1840 9.0 9.0 18.0 - 1841 12.0 12.0 24.0 - 1842 14.0 14.0 28.0 - 1843 14.5 14.5 29.0 - 1844 13.0 13.0 26.0 - 1845 10.0 10.0 20.0 - 1846 5.0 5.0 10.0 - 1847 0.2 5.1 5.3 - 1848 0.0 5.3 5.3 - 1849 0.3 6.5 6.8 - 1850 2.7 8.6 11.3 - 1851 9.4 11.8 21.2 - 1852 21.0 15.7 36.7 0.1444 1853 31.0 18.5 49.5 0.2525 1854 36.6 19.8 56.4 0.2979 1855 38.6 19.6 58.2 0.3265 1856 36.8 17.7 54.5 0.3505 1857 31.1 14.5 45.6 0.3640 1858 23.6 11.8 35.4 0.3333 1859 18.5 11.1 29.6 0.2500 1860 16.5 12.0 28.5 0.1579 1861 17.2 14.0 31.2 0.1026 1862 20.4 17.2 37.6 0.0851 1863 27.1 21.2 48.3 0.1222 1864 37.5 25.5 63.0 0.1905 1865 45.8 31.8 77.6 0.1804 1866 48.7 40.2 88.9 0.0956 1867 46.3 43.1 89.4 0.0358 1868 39.3 39.7 79.0 -0.0050 1869 24.9 26.7 51.6 -0.0348 1870 9.0 6.3 15.3 0.1765 1871 3.3 1.6 4.9 0.3469 1872 3.9 5.6 9.5 -0.1788 1873 7.0 9.7 16.7 -0.1616 1874 13.5 15.0 28.5 -0.0525 1875 22.3 21.2 43.5 0.0253 1876 29.3 29.9 59.2 -0.0100 1877 31.5 36.7 68.2 -0.0761 1878 28.8 35.1 63.9 -0.0985 1879 20.8 19.1 39.9 0.0426 1880 9.0 5.3 14.3 0.2587 1881 2.4 1.4 3.8 0.2631 1882 3.3 2.0 5.3 0.2452 1883 3.5 4.7 8.2 -0.1462 1884 4.8 9.4 14.2 -0.3238 1885 11.1 17.6 28.7 -0.2264 1886 17.9 23.4 41.3 -0.1331 1887 23.8 24.1 47.9 -0.0062 1888 32.5 24.1 56.6 0.1484 1889 35.4 21.2 56.6 0.2509 1890 27.9 15.3 43.2 0.2917 1891 20.6 13.2 33.8 0.2189 1892 16.3 12.0 28.3 0.1519 1893 7.7 9.5 17.2 -0.1045 1894 6.9 12.3 19.2 -0.2811 1895 13.6 16.4 30.0 -0.0932 1896 20.8 18.2 39.0 0.0667 1897 25.2 20.9 46.1 0.0933 1898 27.0 23.0 50.0 0.0800 1899 27.3 22.0 49.3 0.1075 1900 26.4 22.3 48.7 0.0842 1901 28.6 30.1 58.7 -0.0255 1902 34.9 35.5 70.4 -0.0084 1903 34.7 31.6 66.3 0.0468 1904 21.9 21.9 43.8 0.0000 1905 8.4 9.8 18.2 -0.0768 1906 2.5 3.9 6.4 -0.2186 1907 4.4 4.4 8.8 0.0000 1908 11.0 5.5 16.5 0.3333 1909 14.3 9.0 23.3 0.2275 1910 18.1 20.5 38.6 -0.0621 1911 18.5 29.2 47.7 -0.2242 1912 15.3 32.5 47.8 -0.3597 1913 22.5 27.7 50.2 -0.1035 1914 31.0 21.8 52.8 0.1742 1915 24.3 18.5 42.8 0.1355 1916 10.7 13.4 24.1 -0.1119 1917 5.0 8.5 13.5 -0.2591 1918 10.3 6.6 16.9 0.2189 1919 24.9 20.1 45.0 0.1067 1920 37.4 45.6 83.0 -0.0987 1921 42.2 48.8 91.0 -0.0724 1922 42.5 36.8 79.3 0.0719 1923 31.2 31.5 62.7 -0.0047 1924 24.3 25.6 49.9 -0.0260 1925 16.7 20.5 37.2 -0.1020 1926 6.5 10.5 17.0 -0.2352 1927 4.0 3.4 7.4 0.0811 1928 3.0 5.5 8.5 -0.2940 1929 1.0 6.3 7.3 -0.7258 1930 5.2 8.6 13.8 -0.2463 1931 16.0 19.2 35.2 -0.0908 1932 28.6 31.1 59.7 -0.0418 1933 31.2 31.2 62.4 0.0000 1934 20.4 20.6 41.0 -0.0048 1935 13.4 19.7 33.1 -0.1902 1936 14.5 19.1 33.6 -0.1368 1937 8.5 8.1 16.6 0.0241 1938 0.4 5.3 5.7 -0.8594 1939 7.7 14.2 21.9 -0.2967 1940 25.6 20.4 46.0 0.1130 1941 23.9 20.4 44.3 0.0790 1942 21.7 24.9 46.6 -0.0686 1943 35.5 30.3 65.8 0.0790 1944 46.9 30.6 77.5 0.2103 1945 42.3 30.0 72.3 0.1701 1946 27.3 25.4 52.7 0.0361 1947 11.9 15.6 27.5 -0.1344 1948 5.6 8.0 13.6 -0.1764 1949 2.2 5.8 8.0 -0.4498 1950 8.3 9.2 17.5 -0.0513 1951 25.3 14.1 39.4 0.2843 1952 31.8 19.7 51.5 0.2349 1953 33.6 29.3 62.9 0.0684 1954 39.3 35.7 75.0 0.0480 1955 37.4 35.6 73.0 0.0247 1956 22.4 27.3 49.7 -0.0985 1957 8.4 14.1 22.5 -0.2532 1958 2.1 11.4 13.5 -0.6887 1959 10.2 23.8 34.0 -0.3999 1960 41.5 24.2 65.7 0.2633 1961 58.7 21.4 80.1 0.4657 1962 49.0 20.2 69.2 0.4162 1963 38.8 20.6 59.4 0.3064 1964 34.2 23.9 58.1 0.1773 1965 28.7 26.0 54.7 0.0494 1966 25.2 26.0 51.2 -0.0155 1967 18.2 25.5 43.7 -0.1669 1968 10.5 20.2 30.7 -0.3159 1969 4.3 10.4 14.7 -0.4148 1970 1.2 1.4 2.6 -0.0768 1971 7.5 4.0 11.5 0.3043 1972 13.8 7.6 21.4 0.2897 1973 13.6 10.8 24.4 0.1147 1974 15.8 14.8 30.6 0.0327 1975 17.7 15.3 33.0 0.0727 1976 18.2 15.3 33.5 0.0866 1977 11.2 11.0 22.2 0.0090 1978 9.1 6.5 15.6 0.1667 1979 4.1 7.8 11.9 -0.3108 1980 0.3 2.8 3.1 -0.8061 1981 1.6 1.3 2.9 0.1034 1982 10.7 6.5 17.2 0.2442 1983 27.1 16.0 43.1 0.2575 1984 24.8 19.8 44.6 0.1121 1985 30.3 27.5 57.8 0.0484 1986 27.2 28.3 55.5 -0.0197 1987 19.9 16.0 35.9 0.1086 1988 13.3 9.3 22.6 0.1770 1989 6.1 4.7 10.8 0.1296 1990 2.5 3.0 5.5 -0.0908 1991 20.9 21.2 42.1 -0.0070 1992 39.7 35.0 74.7 0.0629 1993 16.4 24.4 40.8 -0.1960 1994 18.6 24.4 43.0 -0.1348 1995 20.8 23.1 43.9 -0.0523 1996 30.3 31.3 61.6 -0.0161 1997 26.8 23.0 49.8 0.0763 1998 13.7 13.2 26.9 0.0186 1999 6.5 7.0 13.5 -0.0369