1768 471.567 1769 468.563 1770 471.951 1771 477.621 1772 480.592 1773 479.952 1774 475.131 1775 479.199 1776 472.469 1777 468.967 1778 468.112 1779 465.367 1780 461.812 1781 458.923 1782 457.607 1783 457.452 1784 452.989 1785 454.207 1786 459.625 1787 463.555 1788 461.923 1789 470.137 1790 471.188 1791 478.457 1792 477.010 1793 469.652 1819 459.580 1828 477.375 1829 474.288 1830 475.528 1831 477.574 1832 469.712 1833 471.634 1834 468.448 1854 470.124 1855 470.154 1856 472.897 1858 471.100 1859 476.981 1860 474.591 1861 476.674 1864 480.610 1865 483.854 1866 492.100 1867 495.300 1869 490.111 1872 496.100 1878 471.600 1881 480.418 1882 483.941 1883 492.057 1884 493.600 1887 486.700 1888 485.000 1889 485.610 1890 485.900 1891 486.608 1892 479.300 1893 479.942 1894 478.172 1895 482.100 1896 477.382 1897 485.300 1898 486.122 1900 495.700 1901 495.260 1902 492.700 1903 506.298 1904 500.127 1905 502.200 1906 508.264 1907 484.668 1908 482.900 1909 483.407 1910 483.300 1911 477.900 1912 482.727 1920 495.502 1922 497.496 1924 498.348 1935 487.684 1938 494.626 1942 500.391 1943 498.340 1944 494.150 1945 493.255 1946 490.020 1947 481.190 1950 480.155 1951 483.247 1952 479.087 1953 483.552 1955 493.111 1956 494.770 1957 502.931 1958 508.713 1959 508.270 1960 514.585 1961 511.794 1962 503.652 1963 498.404 1964 496.355 1965 495.405 1966 498.814 1967 499.698 1968 492.954 1969 492.994 1970 494.882 1971 493.203 1973 500.383 1974 503.492 1975 503.287 1976 505.283 1977 513.125 1978 510.650 1979 513.999 1980 511.794 1981 514.260 1982 507.350 1990 506.537 1992 497.844 1993 502.300 1994 506.770 1995 507.542 1996 504.026