Year Years
1800 387.3
1806 309
1807 325.3
1808 315.5
1809 299.1
1810 302.4
1811 307.3
1812 295.9
1813 302.4
1814 326.9
1815 305.7
1816 289.3
1817 292.6
1818 294.2
1819 307.3
1820 299.1
1821 300.8
1822 322
1823 297.5
1824 312.3
1825 320.4
1826 317.1
1827 294.2
1828 305.7
1829 284.4
1830 385.1
1831 436.9
1832 394.8
1833 422.2
1834 440.1
1835 402.9
1836 383.5
1837 410.9
1838 390
1839 414.1
1840 396.4
1841 407.7
1842 398
1843 420.6
1844 373.8
1845 401.3
1846 407.7
1849 394.8
1850 407.7
1851 393.2
1852 393.2
1853 368.9
1854 443.4
1855 451.5
1856 391.6
1857 388.4
1858 406.1
1859 412.6
1860 385.1
1861 428.7
1862 406.1
1863 420.6
1864 406.1
1865 438.5
1866 451.5
1867 410.9
1868 402.9
1869 393.2
1870 410.9
1871 414.1
1872 438.5
1873 471
1874 422.2
1875 394.8
1876 401.3
1877 419
1878 409.3
1879 390
1880 406.1
1881 406.1
1882 415.7
1883 410.9
1884 401.3
1885 414.1
1886 406.1
1887 396.4
1888 404.5
1889 383.5
1890 420.6
1891 394.8
1892 420.6
1893 377
1894 407.7
1895 391.6
1896 373.8
1897 370.5
1898 364.1
1899 356.1
1900 375.4
1901 339.9
1902 351.2
1903 349.6
1904 341.5
1905 375.4
1906 328.5
1907 339.9
1908 323.6
1909 339.9
1910 307.3
1911 336.6
1912 294.2
1913 309
1914 279.4
1915 354.4
1916 312.3
1917 302.4
1918 313.9
1919 253.2
1922 253.2
1923 227.8
1924 201.6
1925 184.7
1926 192.2
1927 196
1928 186.6
1929 173.4
1930 156.7
1931 154.8
1932 160.4
1933 138.4
1934 134.8
1935 147.4
1936 136.6
1937 134.8
1938 113.7
1939 101.8
1940 103.5
1941 96.88
1942 103.5
1943 112
1944 127.7
1945 263.5
1946 115.4
1947 104.5
1948 92.09
1949 86.87
1950 75.32
1951 69.81
1952 59.54
1953 56.57
1954 54.9
1955 53.4
1956 51.8
1957 49.9
1958 47.9
1959 45.5
1960 42.9
1961 40.2
1962 37.9
1963 35.9
1964 34.2
1965 32.7
1966 31.5
1967 30.5
1968 29.8
1969 29.3
1970 29
1971 28.7
1972 28
1973 26.8
1974 25.1
1975 23.1
1976 21.1
1977 19.4
1978 18.1
1979 17.1
1980 16.3
1981 15.5
1982 14.7
1983 14
1984 13.3
1985 12.6
1986 11.8
1987 11.1
1988 10.5
1989 10
1990 9.5
1991 9
1992 8.5
1993 8
1994 7.4
1995 6.8
1996 6.4
1997 6
1998 5.8
1999 5.6
2000 5.5
2001 5.4
2002 5.3
2003 5.2
2004 5
2005 4.9
2006 4.8
2007 4.6
2008 4.6
2009 4.5
2010 4.4
2011 4.2
2012 4
2013 3.9