Year Years
1800 409.8
1801 409.8
1802 409.8
1803 409.8
1804 409.8
1805 409.8
1806 409.8
1807 409.8
1808 409.8
1809 409.8
1810 409.8
1811 409.8
1812 409.8
1813 409.8
1814 409.8
1815 409.8
1816 409.8
1817 409.8
1818 409.8
1819 409.8
1820 409.8
1821 409.8
1822 409.8
1823 409.8
1824 409.8
1825 409.8
1826 409.8
1827 409.8
1828 409.8
1829 409.8
1830 409.8
1831 409.8
1832 409.8
1833 409.8
1834 409.8
1835 409.8
1836 409.8
1837 409.8
1838 409.8
1839 409.8
1840 409.8
1841 409.8
1842 409.8
1843 409.8
1844 409.8
1845 409.8
1846 409.8
1847 409.8
1848 409.8
1849 409.8
1850 409.8
1851 409.8
1852 409.8
1853 409.8
1854 409.8
1855 409.8
1856 409.8
1857 409.8
1858 409.8
1859 409.8
1860 409.8
1861 409.8
1862 409.8
1863 409.8
1864 409.8
1865 409.8
1866 409.8
1867 409.8
1868 409.8
1869 409.8
1870 409.8
1871 409.8
1872 409.8
1873 409.8
1874 409.8
1875 409.8
1876 409.8
1877 409.8
1878 409.8
1879 409.8
1880 409.8
1881 409.8
1882 409.8
1883 409.8
1884 409.8
1885 409.8
1886 409.8
1887 409.8
1888 409.8
1889 409.8
1890 409.8
1891 409.8
1892 409.8
1893 409.8
1894 409.8
1895 409.8
1896 409.7
1897 409.6
1898 409.4
1899 409.2
1900 408.9
1901 408.6
1902 411.9
1903 414
1904 417.3
1905 420.5
1906 422.4
1907 425.5
1908 428.6
1909 431.7
1910 433.3
1911 436.3
1912 432.6
1913 429
1914 425.3
1915 421.7
1916 416.8
1917 413.3
1918 409.8
1919 406.3
1920 402.8
1921 399.3
1922 386.2
1923 373.3
1924 359.7
1925 347.5
1926 335.5
1927 323.9
1928 311.4
1929 300.3
1930 289.4
1931 278.8
1932 268.4
1933 257.2
1934 247.2
1935 237.5
1936 238.7
1937 239.9
1938 242
1939 243.2
1940 244.4
1950 140.2
1951 135.8
1952 131.7
1953 127.8
1954 123.9
1955 119.9
1956 115.6
1957 111.1
1958 106.7
1959 102.2
1960 98
1961 94
1962 90.4
1963 87
1964 83.9
1965 81.1
1966 78.6
1967 76.4
1968 74.4
1969 72.8
1970 71.4
1971 70.1
1972 68.8
1973 67.5
1974 65.9
1975 64
1976 61.8
1977 59.3
1978 56.4
1979 53.2
1980 49.8
1981 46.2
1982 42.3
1983 38.2
1984 34.1
1985 30.2
1986 26.9
1987 24.3
1988 22.6
1989 21.7
1990 21.3
1991 21.2
1992 21.2
1993 21.1
1994 20.8
1995 20.2
1996 19.5
1997 18.7
1998 17.9
1999 17.1
2000 16.3
2001 15.6
2002 15.1
2003 14.6
2004 14.1
2005 13.7
2006 13
2007 12.3
2008 11.7
2009 11.2
2010 10.7
2011 10.3
2012 10
2013 9.6