Year	Years
1800	33.4
1801	33.4
1802	33.4
1803	33.4
1804	33.4
1805	33.4
1806	33.4
1807	33.4
1808	33.4
1809	33.4
1810	33.4
1811	33.4
1812	33.4
1813	33.4
1814	33.4
1815	33.4
1816	33.4
1817	33.4
1818	33.4
1819	33.4
1820	33.4
1821	33.4
1822	33.4
1823	33.4
1824	33.4
1825	33.4
1826	33.4
1827	33.4
1828	33.4
1829	33.4
1830	33.4
1831	33.4
1832	33.4
1833	33.4
1834	33.4
1835	33.4
1836	33.4
1837	33.4
1838	33.4
1839	33.4
1840	33.4
1841	33.4
1842	33.4
1843	33.4
1844	33.4
1845	33.4
1846	33.4
1847	33.4
1848	33.4
1849	33.4
1850	33.4
1851	33.4
1852	33.4
1853	33.4
1854	33.4
1855	33.4
1856	33.4
1857	33.4
1858	33.4
1859	33.4
1860	33.4
1861	33.4
1862	33.4
1863	33.4
1864	33.4
1865	33.4
1866	33.4
1867	33.4
1868	33.4
1869	33.4
1870	33.4
1871	33.4
1872	33.4
1873	33.39
1874	33.39
1875	33.39
1876	33.39
1877	33.39
1878	33.39
1879	33.38
1880	33.38
1881	33.38
1882	33.38
1883	33.38
1884	33.37
1885	33.37
1886	33.37
1887	33.37
1888	33.37
1889	33.37
1890	33.36
1891	33.36
1892	33.36
1893	33.36
1894	33.36
1895	33.35
1896	33.35
1897	33.35
1898	33.35
1899	33.35
1900	33.35
1901	33.34
1902	33.34
1903	33.34
1904	33.34
1905	33.34
1906	33.34
1907	33.33
1908	33.33
1909	33.33
1910	33.33
1911	33.33
1912	33.32
1913	33.32
1914	33.32
1915	33.32
1916	33.32
1917	33.32
1918	21.6
1919	33.31
1920	33.31
1921	33.31
1922	34.13
1923	34.96
1924	35.79
1925	36.6
1926	37.43
1927	38.25
1928	39.08
1929	39.89
1930	40.72
1931	41.54
1932	42.37
1933	43.18
1934	44.01
1935	44.83
1936	45.66
1937	46.47
1938	47.3
1939	48.12
1940	48.94
1941	49.76
1942	50.58
1943	51.41
1944	52.23
1945	53.05
1946	53.87
1947	54.69
1948	55.52
1949	56.34
1950	57.15
1951	57.65
1952	58.61
1953	59.47
1954	60.27
1955	60.97
1956	61.59
1957	62.15
1958	62.63
1959	63.06
1960	63.44
1961	63.79
1962	64.14
1963	64.49
1964	64.87
1965	65.26
1966	65.68
1967	66.09
1968	66.52
1969	66.93
1970	67.34
1971	67.55
1972	67.75
1973	68.08
1974	68.43
1975	68.76
1976	69.07
1977	69.36
1978	69.65
1979	69.92
1980	70.12
1981	70.51
1982	70.85
1983	71.32
1984	71.71
1985	71.97
1986	72.25
1987	72.36
1988	72.5
1989	72.57
1990	72.65
1991	72.67
1992	72.7
1993	72.72
1994	72.71
1995	72.68
1996	72.93
1997	73.01
1998	73.12
1999	73.24
2000	73.39
2001	73.54
2002	73.64
2003	73.69
2004	73.74
2005	73.85
2006	73.91
2007	73.96
2008	74.05
2009	74.06
2010	74.04
2011	74.19
2012	74.26
2013	74.33
2014	74.4
2015	74.5
2016	74.7
2017	74.86
2018	75.02