Year	Years
1800	420
1801	420
1802	420
1803	420
1804	420
1805	420
1806	420
1807	420
1808	420
1809	420
1810	420
1811	420
1812	420
1813	420
1814	420
1815	420
1816	420
1817	420
1818	420
1819	420
1820	420
1821	420
1822	420
1823	420
1824	420
1825	420
1826	420
1827	420
1828	420
1829	420
1830	420
1831	420
1832	420
1833	420
1834	420
1835	420
1836	420
1837	420
1838	420
1839	420
1840	420
1841	420
1842	420
1843	420
1844	420
1845	420
1846	420
1847	420
1848	420
1849	420
1850	420
1851	420
1852	420
1853	420
1854	420
1855	420
1856	420
1857	420
1858	420
1859	420
1860	420
1861	420
1862	420
1863	420
1864	420
1865	420
1866	420
1867	420
1868	420
1869	420
1870	420
1871	420
1872	420
1873	420
1874	420
1875	420
1876	420
1877	420
1878	420
1879	420
1880	420
1881	420
1882	420
1883	420
1884	420
1885	420
1886	420
1887	420
1888	420
1889	420
1890	420
1891	420
1892	420
1893	420
1894	420
1895	420
1896	419.9
1897	419.8
1898	419.7
1899	419.4
1900	419.1
1901	418.8
1902	418.3
1903	417.9
1904	417.3
1905	416.7
1906	416
1907	415.2
1908	414.4
1909	413.5
1910	412.6
1911	411.6
1912	410.7
1913	409.7
1914	408.7
1915	407.7
1916	406.7
1917	405.8
1918	404.8
1919	403.8
1920	402.8
1921	401.8
1922	400.8
1923	399.8
1924	398.9
1925	397.9
1926	396.9
1927	395.9
1928	394.9
1929	393.9
1930	392.9
1931	391.9
1932	391
1933	390
1934	389
1935	388
1936	387
1937	386
1938	385.1
1939	384.1
1940	383.1
1941	382.1
1942	381.1
1943	380.1
1944	379.1
1945	378.1
1946	353.3
1947	328.5
1948	305.9
1949	283.3
1950	262.6
1978	177.8
1979	171.1
1980	164.6
1981	158.4
1982	152.5
1983	146.6
1984	140.9
1985	135.2
1986	129.6
1987	123.9
1988	118.4
1989	113
1990	107.9
1991	103
1992	98.4
1993	93.9
1994	89.6
1995	85.4
1996	81.2
1997	77
1998	72.8
1999	68.7
2000	64.6
2001	60.5
2002	56.7
2003	53
2004	49.6
2005	46.4
2006	43.6
2007	41.1
2008	39
2009	37.2
2010	35.7
2011	34.2
2012	32.9
2013	31.8