Year Years 1800 340.2 1801 340.2 1802 340.2 1803 340.2 1804 340.2 1805 340.2 1806 340.2 1807 340.2 1808 340.2 1809 340.2 1810 340.2 1811 340.2 1812 340.2 1813 340.2 1814 340.2 1815 340.2 1816 340.2 1817 340.2 1818 340.2 1819 340.2 1820 340.2 1821 340.2 1822 340.2 1823 340.2 1824 340.2 1825 340.2 1826 340.2 1836 474.2 1837 490.4 1838 482.3 1839 462.8 1840 485.6 1841 487.2 1842 516.4 1843 466.1 1844 466.1 1845 469.3 1846 516.4 1847 464.5 1848 506.7 1849 462.8 1850 482.3 1851 466.1 1852 483.9 1853 462.8 1854 472.6 1855 462.8 1856 410.9 1857 498.6 1858 469.3 1859 526.2 1860 422.2 1863 483.9 1864 482.3 1865 539.2 1866 488.8 1867 506.7 1868 498.6 1869 475.8 1870 483.9 1871 535.9 1872 488.8 1873 498.6 1874 482.3 1875 393.2 1876 370.5 1877 365.7 1878 367.3 1879 354.4 1880 390 1881 364.1 1882 370.5 1883 377 1884 381.9 1885 367.3 1886 381.9 1887 352.8 1888 354.4 1889 367.3 1890 367.3 1891 356.1 1892 373.8 1893 364.1 1894 356.1 1895 373.8 1896 338.3 1897 360.9 1898 341.5 1899 351.2 1900 372.2 1901 336.6 1902 297.5 1903 331.8 1904 318.8 1905 333.4 1906 300.8 1907 286 1908 289.3 1909 276.2 1910 263.5 1911 312.3 1912 237 1913 244.3 1914 266.8 1915 238.8 1916 224.1 1917 240.7 1918 256.7 1919 233.3 1920 207.2 1921 212.8 1922 205.3 1923 207.2 1924 164.1 1925 158.5 1926 152.9 1927 143.8 1928 129.4 1929 143.8 1930 122.4 1931 118.9 1932 112 1933 108.6 1934 90.4 1935 147.4 1936 90.4 1937 87.19 1938 81.22 1939 100.2 1940 87.19 1960 42.74 1967 29.2 1968 27.1 1969 26.4 1970 25.7 1971 24.9 1972 24 1973 23.1 1974 22 1975 20.8 1976 19.6 1977 18.3 1978 17.1 1979 16 1980 15 1981 14.1 1982 13.2 1983 12.5 1984 11.8 1985 11.1 1986 10.6 1987 10 1988 9.5 1989 9 1990 8.5 1991 8 1992 7.6 1993 7.2 1994 6.8 1995 6.5 1996 6.2 1997 5.9 1998 5.7 1999 5.5 2000 5.4 2001 5.2 2002 5.1 2003 5 2004 4.9 2005 4.7 2006 4.6 2007 4.5 2008 4.4 2009 4.3 2010 4.2 2011 4.1 2012 4 2013 3.9