Year	Ratio
1869	4.57000
1870	4.12200
1871	3.90600
1872	4.34000
1873	4.35400
1874	4.23100
1875	3.99500
1876	4.19100
1877	4.48200
1878	4.69900
1879	4.66700
1880	4.96700
1881	4.10000
1882	4.16500
1883	3.76400
1884	3.74700
1885	3.42700
1886	3.30000
1887	3.22100
1888	3.09800
1889	3.05900
1890	2.93400
1891	2.93800
1892	2.81300
1893	2.86600
1894	2.54600
1895	2.70900
1896	2.67400
1897	2.81400
1898	2.55200
1899	2.47800
1900	2.52800
1901	2.47300
1902	2.35300
1903	2.34400
1904	2.21200
1905	2.17500
1906	2.32000
1907	2.30200
1908	2.08200
1909	2.23500
1910	2.19800
1911	2.09500
1912	2.14700
1913	2.17400
1914	1.91100
1915	1.89600
1916	2.12000
1917	2.18000
1918	2.50800
1919	2.28000
1920	2.19600
1921	1.89600
1922	1.88300
1923	2.04000
1924	1.96700
1925	1.88400
1926	1.95100
1927	1.87300
1928	1.84500
1929	1.95300
1930	1.70100
1931	1.47000
1932	1.28100
1933	1.38100
1934	1.51800
1935	1.52500
1936	1.59800
1937	1.66800
1938	1.53500
1939	1.52300
1940	1.50900
1941	1.60800
1942	1.83700
1943	1.76600
1944	1.61400
1945	1.37200
1946	1.16300
1947	1.20200
1948	1.33500
1949	1.30100
1950	1.41000
1951	1.56700
1952	1.55800
1953	1.57000
1954	1.50900
1955	1.58900
1956	1.65600
1957	1.68300
1958	1.61300
1959	1.68300
1960	1.74100
1961	1.70100
1962	1.70100
1963	1.66000
1964	1.65700
1965	1.65300
1966	1.68000