Year Years
1800 503.4
1801 503.4
1802 503.4
1803 503.4
1804 503.4
1805 503.4
1806 503.4
1807 503.4
1808 503.4
1809 503.4
1810 503.4
1811 503.4
1812 503.4
1813 503.4
1814 503.4
1815 503.4
1816 503.4
1817 503.4
1818 503.4
1819 503.4
1820 503.4
1821 503.4
1822 503.4
1823 503.4
1824 503.4
1825 503.4
1826 503.4
1827 503.4
1828 503.4
1829 503.4
1830 503.4
1831 503.4
1832 503.4
1833 503.4
1834 503.4
1835 503.4
1836 503.4
1837 503.4
1838 503.4
1839 503.4
1840 503.4
1841 503.4
1842 503.4
1843 503.4
1844 503.4
1845 503.4
1846 503.4
1847 503.4
1848 503.4
1849 503.4
1850 503.4
1851 503.4
1852 503.4
1853 503.4
1854 503.4
1855 503.4
1856 503.4
1857 503.4
1858 503.4
1859 503.4
1860 503.4
1861 503.4
1862 503.4
1863 503.4
1864 503.4
1865 503.4
1866 503.4
1867 503.4
1868 503.4
1869 503.4
1870 503.4
1871 503.4
1872 503.4
1873 503.4
1874 503.4
1875 503.4
1876 503.4
1877 503.4
1878 503.4
1879 503.4
1880 503.4
1881 503.4
1882 503.4
1883 503.4
1884 503.4
1885 503.4
1886 503.4
1887 503.4
1888 503.4
1889 503.4
1890 503.4
1891 503.4
1892 503.4
1893 503.4
1894 503.4
1895 503.3
1896 503.2
1897 503.1
1898 502.9
1899 502.6
1900 502.3
1901 501.8
1902 501.3
1903 500.7
1904 507.6
1905 512.8
1906 519.6
1907 524.8
1908 531.6
1909 525.8
1910 520
1911 514.2
1912 508.5
1913 502.7
1914 495.6
1915 488.6
1916 481.7
1917 474.8
1918 468
1919 460
1920 452
1921 444.2
1922 436.5
1923 428.9
1924 417.6
1925 405.3
1926 394.4
1927 383.8
1928 373.4
1929 363.2
1930 354.4
1931 344.5
1932 336
1933 326.5
1934 315.1
1935 302.9
1936 292
1937 281.4
1938 270
1939 263.6
1940 258.2
1950 348.6
1951 303.7
1952 264.3
1953 230.2
1954 201.5
1955 178
1956 158.8
1957 143.5
1958 131.2
1959 121.5
1960 113.6
1961 106.8
1962 100.7
1963 95
1964 89.2
1965 83.3
1966 77.3
1967 71.2
1968 64.9
1969 58.6
1970 52.4
1971 46.4
1972 40.8
1973 35.6
1974 31
1975 26.9
1976 23.4
1977 20.4
1978 17.9
1979 15.9
1980 14.4
1981 13.1
1982 12.2
1983 11.4
1984 10.6
1985 9.9
1986 9.3
1987 8.6
1988 8
1989 7.6
1990 7.1
1991 6.8
1992 6.4
1993 6.1
1994 5.8
1995 5.5
1996 5.3
1997 5.3
1998 5.4
1999 5.7
2000 6.1
2001 6.4
2002 6.5
2003 6.4
2004 6
2005 5.6
2006 5.2
2007 4.8
2008 4.5
2009 4.3
2010 4.1
2011 4
2012 3.9
2013 3.7