Year Years
1800 406
1801 406
1802 406
1803 406
1804 406
1805 406
1806 406
1807 406
1808 406
1809 406
1810 406
1811 406
1812 406
1813 406
1814 406
1815 406
1816 406
1817 406
1818 406
1819 406
1820 406
1821 406
1822 406
1823 406
1824 406
1825 406
1826 406
1827 406
1828 406
1829 406
1830 393.5
1831 381.2
1832 369.2
1833 358.6
1834 347.1
1835 335.7
1836 335.7
1837 335.7
1838 335.7
1839 335.7
1840 335.7
1841 335.7
1842 335.7
1843 335.7
1844 335.7
1845 335.7
1846 335.7
1847 335.7
1848 335.7
1849 335.7
1850 335.7
1851 335.7
1852 335.7
1853 335.7
1854 335.7
1855 335.7
1856 335.7
1857 335.7
1858 335.7
1859 335.7
1860 335.7
1861 335.7
1862 335.7
1863 335.7
1864 335.7
1865 335.7
1866 335.7
1867 335.7
1868 335.7
1869 335.7
1870 335.7
1871 335.7
1872 335.7
1873 335.7
1874 335.7
1875 335.7
1876 335.7
1877 335.7
1878 335.7
1879 335.7
1880 335.7
1881 335.7
1882 335.7
1883 335.7
1884 335.7
1885 335.7
1886 335.7
1887 335.7
1888 335.7
1889 335.7
1890 335.7
1891 335.7
1892 335.7
1893 335.7
1894 335.7
1895 335.7
1896 335.6
1897 335.6
1898 335.4
1899 335.2
1900 335
1901 334.7
1902 334.4
1903 334
1904 333.5
1905 333
1906 332.5
1907 331.9
1908 331.2
1918 220.3
1919 251.5
1920 284.4
1921 224.1
1922 222.2
1923 205.3
1924 194.1
1925 212.8
1926 229.6
1927 188.4
1928 203.5
1929 201.6
1930 199.7
1931 231.5
1932 165.9
1933 207.2
1934 199.7
1935 147.4
1936 143.8
1937 186.6
1938 145.6
1939 156.7
1940 160.4
1941 165.9
1942 184.7
1943 136.6
1944 113.7
1945 120.6
1946 112
1947 115.4
1948 105.2
1949 113.7
1953 87.8
1954 84.9
1955 82
1956 79.1
1957 76.2
1958 73.6
1959 70.9
1960 68.3
1961 65.9
1962 63.7
1963 61.6
1964 59.8
1965 58.1
1966 56.6
1967 55.2
1968 54
1969 52.8
1970 51.8
1971 50.7
1972 49.6
1973 48.5
1974 47.3
1975 46
1976 44.8
1977 43.4
1978 42.1
1979 40.8
1980 39.5
1981 38.3
1982 37.1
1983 36
1984 35
1985 34
1986 33.1
1987 32.4
1988 31.7
1989 31.1
1990 30.6
1991 30.1
1992 29.7
1993 29.4
1994 29.2
1995 29
1996 28.9
1997 28.9
1998 28.8
1999 28.7
2000 28.6
2001 28.5
2002 28.2
2003 27.8
2004 27.4
2005 26.8
2006 26.2
2007 25.5
2008 24.8
2009 24.1
2010 23.4
2011 22.7
2012 21.9
2013 21.3