Year Years
1800 420
1801 420
1802 420
1803 420
1804 420
1805 420
1806 420
1807 420
1808 420
1809 420
1810 420
1811 420
1812 420
1813 420
1814 420
1815 420
1816 420
1817 420
1818 420
1819 420
1820 420
1821 420
1822 420
1823 420
1824 420
1825 420
1826 420
1827 420
1828 420
1829 420
1830 420
1831 420
1832 420
1833 420
1834 420
1835 420
1836 420
1837 420
1838 420
1839 420
1840 420
1841 420
1842 420
1843 420
1844 420
1845 420
1846 420
1847 420
1848 420
1849 420
1850 420
1851 420
1852 420
1853 420
1854 420
1855 420
1856 420
1857 420
1858 420
1859 420
1860 420
1861 420
1862 420
1863 420
1864 420
1865 420
1866 420
1867 420
1868 420
1869 420
1870 420
1871 420
1872 420
1873 420
1874 420
1875 420
1876 420
1877 420
1878 420
1879 420
1880 420
1881 420
1882 420
1883 420
1884 420
1885 420
1886 420
1887 420
1888 420
1889 420
1890 420
1891 420
1892 420
1893 420
1894 420
1895 420
1896 419.9
1897 419.8
1898 419.7
1899 419.4
1900 419.1
1901 418.8
1902 418.3
1903 417.9
1904 417.3
1905 416.7
1906 416
1907 415.2
1908 414.4
1909 413.5
1910 412.6
1911 411.6
1912 410.7
1913 409.7
1914 408.7
1915 407.7
1916 406.7
1917 405.8
1918 404.8
1919 403.8
1920 402.8
1921 401.8
1922 400.8
1923 399.8
1924 398.9
1925 397.9
1926 396.9
1927 395.9
1928 394.9
1929 393.9
1930 392.9
1931 387.1
1932 381.4
1933 376.9
1934 371.3
1935 365.8
1936 360.2
1937 354.8
1938 350.6
1939 345.3
1940 340
1941 334.8
1942 329.6
1943 325.6
1944 320.5
1954 250.1
1955 244.5
1956 238.9
1957 233.4
1958 227.6
1959 221.5
1960 216.1
1961 211.9
1962 208.8
1963 206.5
1964 205.4
1965 205.2
1966 206
1967 207.6
1968 210.1
1969 213.1
1970 216.6
1971 220.3
1972 224.3
1973 229.6
1974 235.9
1975 241.8
1976 245.9
1977 246.2
1978 240.8
1979 228.9
1980 214
1981 198
1982 183.3
1983 171.9
1984 164
1985 158.4
1986 153.9
1987 150.6
1988 148.9
1989 149.2
1990 151.8
1991 156.8
1992 163.5
1993 179
1994 287.5
1995 253.2
1996 190.7
1997 215.7
1998 230.9
1999 198.9
2000 181.9
2001 167.5
2002 151.2
2003 135.2
2004 120.1
2005 106.4
2006 94.6
2007 84.3
2008 75.8
2009 69.1
2010 63.6
2011 58.7
2012 54.9
2013 52