| 1792 1.293 |
| 1793 1.293 |
| 1794 1.293 |
| 1795 1.293 |
| 1796 1.293 |
| 1797 1.293 |
| 1798 1.293 |
| 1799 1.293 |
| 1800 1.293 |
| 1801 1.293 |
| 1802 1.293 |
| 1803 1.293 |
| 1804 1.293 |
| 1805 1.293 |
| 1806 1.293 |
| 1807 1.293 |
| 1808 1.293 |
| 1809 1.293 |
| 1810 1.293 |
| 1811 1.293 |
| 1812 1.293 |
| 1813 1.293 |
| 1814 1.453 |
| 1815 1.477 |
| 1816 1.323 |
| 1817 1.293 |
| 1818 1.293 |
| 1819 1.293 |
| 1820 1.293 |
| 1821 1.293 |
| 1822 1.293 |
| 1823 1.293 |
| 1824 1.293 |
| 1825 1.293 |
| 1826 1.293 |
| 1827 1.293 |
| 1828 1.293 |
| 1829 1.293 |
| 1830 1.293 |
| 1831 1.293 |
|
| 1832 1.293 |
| 1833 1.293 |
| 1834 1.293 |
| 1835 1.293 |
| 1836 1.293 |
| 1837 1.350 |
| 1838 1.296 |
| 1839 1.296 |
| 1840 1.296 |
| 1841 1.292 |
| 1842 1.293 |
| 1843 1.292 |
| 1844 1.292 |
| 1845 1.292 |
| 1846 1.292 |
| 1847 1.292 |
| 1848 1.292 |
| 1849 1.292 |
| 1850 1.292 |
| 1851 1.292 |
| 1852 1.292 |
| 1853 1.292 |
| 1854 1.292 |
| 1855 1.292 |
| 1856 1.292 |
| 1857 1.294 |
| 1858 1.292 |
| 1859 1.292 |
| 1860 1.292 |
| 1861 1.292 |
| 1862 1.709 |
| 1863 1.952 |
| 1864 2.939 |
| 1865 1.889 |
| 1866 1.766 |
| 1867 1.741 |
| 1868 1.747 |
| 1869 1.569 |
| 1870 1.430 |
| 1871 1.412 |
|
| 1872 1.449 |
| 1873 1.421 |
| 1874 1.411 |
| 1875 1.394 |
| 1876 1.315 |
| 1877 1.212 |
| 1878 1.100 |
| 1879 1.144 |
| 1880 1.116 |
| 1881 1.129 |
| 1882 1.099 |
| 1883 1.110 |
| 1884 1.084 |
| 1885 1.032 |
| 1886 1.006 |
| 1887 0.970 |
| 1888 0.936 |
| 1889 0.959 |
| 1890 1.056 |
| 1891 0.956 |
| 1892 0.840 |
| 1893 0.703 |
| 1894 0.615 |
| 1895 0.677 |
| 1896 0.664 |
| 1897 0.590 |
| 1898 0.603 |
| 1899 0.600 |
| 1900 0.648 |
| 1901 0.558 |
| 1902 0.487 |
| 1903 0.560 |
| 1904 0.612 |
| 1905 0.655 |
| 1906 0.696 |
| 1907 0.552 |
| 1908 0.494 |
| 1909 0.529 |
| 1910 0.553 |
| 1911 0.556 |
|
| 1912 0.640 |
| 1913 0.584 |
| 1914 0.503 |
| 1915 0.561 |
| 1916 0.758 |
| 1917 0.899 |
| 1918 1.019 |
| 1919 1.336 |
| 1920 0.655 |
| 1921 0.663 |
| 1922 0.643 |
| 1923 0.650 |
| 1924 0.692 |
| 1925 0.692 |
| 1926 0.538 |
| 1927 0.583 |
| 1928 0.577 |
| 1929 0.488 |
| 1930 0.330 |
| 1931 0.304 |
| 1932 0.254 |
| 1933 0.437 |
| 1934 0.544 |
| 1935 0.584 |
| 1936 0.454 |
| 1937 0.438 |
| 1938 0.428 |
| 1939 0.350 |
| 1940 0.348 |
| 1941 0.351 |
| 1942 0.448 |
| 1943 0.448 |
| 1944 0.448 |
| 1945 0.708 |
| 1946 0.867 |
| 1947 0.746 |
| 1948 0.700 |
| 1949 0.733 |
| 1950 0.800 |
| 1951 0.880 |
|
| 1952 0.833 |
| 1953 0.853 |
| 1954 0.853 |
| 1955 0.905 |
| 1956 0.914 |
| 1957 0.898 |
| 1958 0.899 |
| 1959 0.914 |
| 1960 0.914 |
| 1961 1.033 |
| 1962 1.199 |
| 1963 1.293 |
| 1964 1.293 |
| 1965 1.293 |
| 1966 1.293 |
| 1967 2.060 |
| 1968 1.959 |
| 1969 1.807 |
| 1970 1.635 |
| 1971 1.394 |
| 1972 1.976 |
| 1973 3.137 |
| 1974 4.391 |
| 1975 4.085 |
| 1976 4.347 |
| 1977 4.706 |
| 1978 5.930 |
| 1979 21.793 |
| 1980 16.393 |
| 1981 8.432 |
| 1982 10.586 |
| 1983 9.121 |
| 1984 6.694 |
| 1985 5.888 |
| 1986 5.364 |
| 1987 6.790 |
| 1988 6.108 |
| 1989 5.543 |
| 1990 4.068 |
| 1991 3.909 |
|
| 1992 3.710 |
| 1993 4.968 |
| 1994 4.769 |
| 1995 5.148 |
| 1996 4.730 |
| 1997 5.945 |
|
