Year Years
1800 380
1801 378.8
1802 377.6
1803 376.4
1804 375.2
1805 374
1806 372.8
1807 371.6
1808 370.4
1809 369.2
1810 368
1811 366.8
1812 366.8
1813 365.7
1814 364.5
1815 363.3
1816 362.1
1817 361
1818 359.8
1819 358.6
1820 357.4
1821 356.3
1822 355.1
1823 354
1824 352.8
1825 351.7
1835 299.3
1836 279.6
1837 252.1
1838 240.3
1839 267.1
1840 270.6
1841 254.6
1842 254.2
1843 232.2
1844 236
1845 249.2
1846 285.3
1847 280.7
1848 280.3
1849 276.9
1850 242.8
1851 239.9
1852 261.8
1853 278.6
1854 236.5
1855 192.7
1856 199.8
1857 241
1858 271.8
1859 225.7
1860 217.5
1861 188.2
1862 195
1863 195.5
1864 260.1
1865 266.8
1866 239.5
1867 221.8
1868 220.9
1869 208.1
1870 212.6
1871 199.6
1872 190.6
1873 188.8
1874 205.3
1875 226.4
1876 211.7
1877 198
1878 202.9
1879 207.3
1880 231.4
1881 187
1882 221.7
1883 189.7
1884 195
1885 176.2
1886 187.6
1887 196.3
1888 211.9
1889 203.9
1890 205.7
1891 206.7
1892 207
1893 221.2
1894 196.2
1895 183.8
1896 166.2
1897 168.5
1898 164.8
1899 192.9
1900 163.4
1901 170.6
1902 148.8
1903 146.7
1904 139.5
1905 150.7
1906 135.5
1907 136.2
1908 152.5
1909 123.6
1910 122.2
1911 129.6
1912 116
1913 113.9
1914 117.7
1915 112.2
1916 128.8
1917 122.7
1918 99.09
1919 116.5
1920 119.9
1921 91.28
1922 98.18
1923 101.4
1924 103.1
1925 94.53
1926 98.62
1927 98.83
1928 97.09
1929 93.39
1930 93.81
1931 94.5
1932 84.97
1933 78.21
1934 75.61
1935 87.19
1936 80.9
1937 77.48
1938 70.46
1939 66.8
1940 58.85
1941 64.58
1942 57.44
1943 54.22
1944 58.91
1945 58.19
1946 54.05
1947 45.8
1948 40.46
1949 38.73
1950 34
1951 33.4
1952 32.6
1953 31.6
1954 30.5
1955 29.3
1956 28.1
1957 27
1958 26.2
1959 25.6
1960 25
1961 24.4
1962 23.8
1963 23
1964 22.1
1965 21.1
1966 20
1967 19
1968 18.1
1969 17.4
1970 16.6
1971 15.7
1972 14.9
1973 13.9
1974 13.1
1975 12.3
1976 11.6
1977 11.1
1978 10.6
1979 10.3
1980 10
1981 9.7
1982 9.6
1983 9.6
1984 9.6
1985 9.6
1986 9.7
1987 9.7
1988 9.6
1989 9.3
1990 8.9
1991 8.4
1992 7.9
1993 7.4
1994 6.9
1995 6.5
1996 6.2
1997 6
1998 5.8
1999 5.7
2000 5.6
2001 5.5
2002 5.4
2003 5.3
2004 5.1
2005 4.9
2006 4.7
2007 4.5
2008 4.3
2009 4.2
2010 4
2011 3.8
2012 3.7
2013 3.5