Year Years
1800 452
1801 452
1802 452
1803 452
1804 452
1805 452
1806 452
1807 452
1808 452
1809 452
1810 452
1811 452
1812 452
1813 452
1814 452
1815 452
1816 452
1817 452
1818 452
1819 452
1820 452
1821 452
1822 452
1823 452
1824 452
1825 452
1826 452
1827 452
1828 452
1829 452
1830 452
1831 452
1832 452
1833 452
1834 452
1835 452
1836 452
1837 452
1838 452
1839 452
1840 452
1841 452
1842 452
1843 452
1844 452
1845 452
1846 452
1847 452
1848 452
1849 452
1850 452
1851 452
1852 452
1853 452
1854 452
1855 452
1856 452
1857 452
1858 452
1859 452
1860 452
1861 452
1862 452
1863 452
1864 452
1865 452
1866 452
1867 452
1868 452
1869 452
1870 452
1871 452
1872 452
1873 452
1874 452
1875 452
1876 452
1877 452
1878 452
1879 452
1880 452
1881 452
1882 452
1883 452
1884 452
1885 452
1886 452
1887 452
1888 452
1889 452
1890 452
1891 452
1892 452
1893 452
1894 451.9
1895 451.9
1896 451.9
1897 451.7
1898 451.6
1899 451.3
1900 451
1901 450.6
1902 450.1
1903 449.6
1904 449
1905 448.3
1906 447.6
1907 446.8
1908 445.9
1909 444.9
1910 444
1911 442.9
1912 441.9
1913 440.8
1914 439.8
1915 438.7
1916 437.6
1917 436.6
1918 435.5
1919 434.5
1920 433.4
1921 432.3
1922 431.3
1923 430.2
1924 429.2
1925 428.1
1926 427
1927 426
1928 424.9
1929 423.9
1930 422.8
1931 421.7
1932 420.7
1933 419.6
1934 418.6
1935 417.5
1936 416.4
1937 415.4
1938 414.3
1939 413.2
1940 412.2
1941 411.1
1942 410.1
1943 409
1944 407.9
1945 406.9
1946 396.1
1947 386.7
1948 376.4
1949 367.3
1950 357.4
1951 354.2
1952 348.9
1953 343.1
1954 337
1955 330.6
1956 323.8
1957 316.6
1958 309.2
1959 301.9
1960 294.6
1961 287.5
1962 280.5
1963 273.5
1964 266.6
1965 259.7
1966 252.8
1967 246
1968 239.6
1969 233.5
1970 227.8
1971 223.2
1972 218.3
1982 190.3
1983 188.9
1984 187.3
1985 186.5
1986 185.6
1987 185.1
1988 184.2
1989 182.3
1990 179.7
1991 176.8
1992 174.7
1993 173.8
1994 173.6
1995 173.6
1996 173.6
1997 173.6
1998 173.6
1999 173.6
2000 173.6
2001 173.6
2002 173.6
2003 173.6
2004 173.6
2005 173.6
2006 173
2007 171.2
2008 167.8
2009 163.6
2010 159
2011 154.7
2012 150.1
2013 145.6