Year Years 1800 412.3 1801 407.2 1802 400.9 1803 395.9 1804 391 1805 384.9 1806 380 1816 273.2 1817 283.5 1818 293.7 1819 312.2 1820 284.8 1821 287.3 1822 309.4 1823 289.2 1824 305.6 1825 305.7 1826 303.7 1827 284.5 1828 312.8 1829 284.3 1830 282.9 1831 283.5 1832 297.9 1833 286.5 1834 338 1835 277.3 1836 259.1 1837 274.1 1838 286.5 1839 268 1840 260.7 1841 262.5 1842 270.1 1843 268.9 1844 251.9 1845 236.9 1846 271.6 1847 258.1 1848 264.8 1849 301.1 1850 238.1 1851 262.1 1852 265.1 1853 244.4 1854 298 1855 278.7 1856 268.6 1857 285.4 1858 282.4 1859 347.3 1860 243.3 1861 291.1 1862 258.3 1863 275.2 1864 264.9 1865 283.2 1866 253.3 1867 263.4 1868 288.4 1869 273.6 1870 300.3 1871 343.9 1872 254.9 1873 267 1874 241.7 1875 245.7 1876 240.4 1877 237.1 1878 249.5 1879 235.4 1880 257 1881 244.1 1882 248.4 1883 247.9 1884 260 1885 240.2 1886 250 1887 242.6 1888 241.8 1889 229.5 1890 250.6 1891 235.5 1892 250.2 1893 249 1894 226.3 1895 228.2 1896 203.2 1897 207 1898 228.5 1899 234.2 1900 224 1901 206.6 1902 196.6 1903 194.4 1904 201.7 1905 190.7 1906 200 1907 184 1908 181.6 1909 167.5 1910 160.1 1911 204.3 1912 157 1913 163 1914 155.1 1915 165.9 1916 164.2 1917 181 1918 221.7 1919 177.8 1920 167.8 1921 155.2 1922 119.1 1923 134 1924 118.9 1925 127.5 1926 134.2 1927 118 1928 126.6 1929 130.2 1930 109.4 1931 104.7 1932 106.2 1933 100.4 1934 97.73 1935 91.85 1936 92.38 1937 89.81 1938 89.52 1939 85.66 1940 115.3 1941 94.15 1942 96.55 1943 101.2 1944 105 1945 136.3 1946 97.32 1947 82.75 1948 65.1 1949 70.16 1950 57.2 1951 53.4 1952 49.8 1953 46.3 1954 43.1 1955 40.2 1956 37.4 1957 34.8 1958 32.4 1959 30.3 1960 28.5 1961 27 1962 25.7 1963 24.5 1964 23.4 1965 22.3 1966 21.4 1967 20.6 1968 19.9 1969 19.1 1970 18.2 1971 17.4 1972 16.6 1973 15.9 1974 15.4 1975 15 1976 14.5 1977 13.9 1978 13.3 1979 12.8 1980 12.4 1981 11.9 1982 11.5 1983 11.1 1984 10.7 1985 10.3 1986 10.1 1987 9.8 1988 9.6 1989 9.3 1990 9 1991 8.6 1992 8.1 1993 7.6 1994 7 1995 6.5 1996 6.1 1997 5.8 1998 5.6 1999 5.5 2000 5.4 2001 5.3 2002 5.1 2003 4.9 2004 4.7 2005 4.6 2006 4.5 2007 4.4 2008 4.3 2009 4.3 2010 4.2 2011 4.2 2012 4.2 2013 4.2