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