Year	Years
1800	418.7
1801	418.7
1802	418.7
1803	418.7
1804	418.7
1805	418.7
1806	418.7
1807	418.7
1808	418.7
1809	418.7
1810	418.7
1811	418.7
1812	418.7
1813	418.7
1814	418.7
1815	418.7
1816	418.7
1817	418.7
1818	418.7
1819	418.7
1820	418.7
1821	418.7
1822	418.7
1823	418.7
1824	418.7
1825	418.7
1826	418.7
1827	418.7
1828	418.7
1829	418.7
1830	418.7
1831	418.7
1832	418.7
1833	418.7
1834	418.7
1835	418.7
1836	418.7
1837	418.7
1838	418.7
1839	418.7
1840	418.7
1841	418.7
1842	418.7
1843	418.7
1844	418.7
1845	418.7
1846	418.7
1847	418.7
1848	418.7
1849	418.7
1850	418.7
1851	418.7
1852	418.7
1853	418.7
1854	418.7
1855	418.7
1856	418.7
1857	418.7
1867	394.8
1868	485.6
1869	446.6
1870	402.9
1871	445
1872	479.1
1873	425.5
1874	425.5
1875	432
1876	451.5
1877	422.2
1878	487.2
1879	409.3
1880	464.5
1881	409.3
1882	488.8
1883	461.2
1884	412.6
1885	438.5
1886	402.9
1887	415.7
1888	406.1
1889	446.6
1890	474.2
1891	441.7
1892	498.6
1893	409.3
1894	430.4
1895	453.1
1896	445
1897	422.2
1898	453.1
1899	390
1900	409.3
1901	441.7
1902	419
1903	406.1
1904	377
1905	441.7
1906	402.9
1907	365.7
1908	396.4
1909	402.9
1910	440.1
1911	385.1
1959	63.52
1960	56.28
1961	49.88
1962	48.2
1963	45.68
1964	41.58
1965	39.15
1966	37.71
1967	37.24
1968	37.52
1969	36.44
1970	44.7
1971	42.8
1972	41.1
1973	39.5
1974	38
1975	36.8
1976	35.8
1977	35
1978	34.3
1979	33.7
1980	33.1
1981	32.5
1982	31.9
1983	31.3
1984	30.7
1985	29.9
1986	29.1
1987	28.1
1988	27.2
1989	26.4
1990	26
1991	25.9
1992	26.1
1993	26.3
1994	26.4
1995	26.3
1996	26
1997	25.6
1998	25
1999	24.2
2000	23.2
2001	22
2002	20.7
2003	19.4
2004	18
2005	16.7
2006	15.5
2007	14.5
2008	13.5
2009	12.6
2010	11.8
2011	11.2
2012	10.6
2013	10.1