Year	Ratio
1800	895.6
1801	839.6
1802	841.7
1803	818.6
1804	754.8
1805	667.5
1806	866.2
1807	866.3
1808	870.7
1809	1008
1810	887
1811	896.8
1812	828.8
1813	738.7
1814	764.8
1815	746.1
1816	691.4
1817	751.3
1818	757.2
1819	740.7
1820	757.9
1821	754.8
1822	780.4
1823	706.3
1824	570.7
1825	565.2
1826	618.8
1827	645.6
1828	705.8
1829	721.7
1830	658.4
1831	627.7
1832	569.8
1833	593.2
1834	574.7
1835	514.6
1836	543.1
1837	547.5
1838	467.1
1839	507.9
1840	610.2
1841	622.6
1842	669.5
1843	459.9
1844	426
1845	430.3
1846	494.5
1847	441.6
1848	415.5
1849	471.9
1850	467.4
1851	472.7
1852	453.3
1853	421.9
1854	445.4
1855	441.5
1856	352.8
1857	370.3
1858	509.9
1859	528.1
1860	488.1
1861	514.1
1862	560.1
1863	566
1864	597
1865	595.8
1866	511.7
1867	496
1868	498.5
1869	591.4
1870	648.4
1871	569.4
1872	468.6
1873	556
1874	907.3
1875	673.7
1876	618.1
1877	493.9
1878	429.1
1879	443.7
1880	476.7
1881	488.7
1882	372.3
1883	412.4
1884	355.3
1885	436.2
1886	372.5
1887	443.8
1888	343.7
1889	315
1890	303.9
1891	336.5
1892	367.2
1893	369.7
1894	299.1
1895	277.1
1896	246.4
1897	256.4
1898	206.6
1899	248.7
1900	188.2
1901	226
1902	222.8
1903	227.8
1904	213.4
1905	245.9
1906	237.9
1907	298.3
1908	212.4
1909	250.2
1910	254.4
1911	266.2
1912	232.6
1913	227.3
1914	260.3
1915	290.3
1916	266.3
1917	245.7
1918	257.7
1919	320.3
1920	400.7
1921	269.3
1922	251.4
1923	231.9
1924	238.4
1925	263.4
1926	294.1
1927	277.6
1928	330
1929	379.1
1930	348.1
1931	367.8
1932	344.2
1933	307
1934	332.6
1935	256.1
1936	314.8
1937	309.8
1938	239.5
1939	226.9
1940	216.1
1941	204.6
1942	156.2
1943	154.7
1944	157.8
1945	133
1946	95.8
1947	87
1948	75
1949	66.8
1950	61.5
1951	86.2
1952	59
1953	61.7
1954	54.2
1955	49.4
1956	35.2
1957	36.4
1958	30.3
1959	23.9
1960	38.2
1961	21.1
1962	13
1963	26.6
1964	19.6
1965	13.8
1966	10.5
1967	14
1968	8.8
1969	10.2
1970	9.4
1971	8.3
1972	5.9
1973	5.7
1974	4
1975	4.4
1976	5.8
1977	7.3
1978	6.3
1979	6.3
1980	5.8
1990	6
1995	5
2000	5
2005	4
2010	5
2013	4