Year	Years
1800	31.4
1801	31.4
1802	31.4
1803	31.4
1804	31.4
1805	31.4
1806	31.4
1807	31.4
1808	31.4
1809	31.4
1810	31.4
1811	31.4
1812	31.4
1813	31.4
1814	31.4
1815	31.4
1816	31.4
1817	31.4
1818	31.4
1819	31.4
1820	31.4
1821	31.4
1822	31.4
1823	31.4
1824	31.4
1825	31.4
1826	31.4
1827	31.4
1828	31.4
1829	31.4
1830	31.4
1831	31.4
1832	31.4
1833	31.4
1834	31.4
1835	31.4
1836	31.4
1837	31.4
1838	31.4
1839	32.38
1840	33.37
1841	34.35
1842	35.33
1843	36.32
1844	37.3
1845	37.3
1846	37.3
1847	37.3
1848	37.3
1849	37.3
1850	37.3
1851	37.3
1852	37.3
1853	37.3
1854	37.3
1855	37.3
1856	37.3
1857	37.3
1858	37.3
1859	37.3
1860	37.3
1861	37.3
1862	37.3
1863	37.3
1864	37.3
1865	37.3
1866	37.3
1867	37.3
1868	37.3
1869	37.3
1870	37.3
1871	37.32
1872	37.34
1873	37.36
1874	37.38
1875	37.4
1876	37.42
1877	37.44
1878	37.46
1879	37.48
1880	37.5
1881	37.53
1882	37.55
1883	37.57
1884	37.59
1885	37.61
1886	37.63
1887	37.65
1888	37.67
1889	37.69
1890	37.71
1891	37.73
1892	37.75
1893	37.77
1894	37.79
1895	37.81
1896	37.83
1897	37.85
1898	37.87
1899	37.89
1900	37.91
1901	37.94
1902	37.96
1903	37.98
1904	38
1905	38.02
1906	38.04
1907	38.06
1908	38.08
1909	38.1
1910	38.12
1911	38.14
1912	38.16
1913	38.18
1914	38.2
1915	38.22
1916	38.24
1917	38.26
1918	24.83
1919	38.3
1920	38.32
1921	38.34
1922	39.07
1923	39.81
1924	40.54
1925	41.27
1926	42
1927	42.74
1928	43.47
1929	44.21
1930	44.94
1931	45.68
1932	46.32
1933	46.94
1934	47.58
1935	48.21
1936	48.84
1937	49.48
1938	50.11
1939	50.74
1940	51.38
1941	52.02
1942	52.65
1943	53.29
1944	53.94
1945	54.57
1946	55.21
1947	55.83
1948	56.44
1949	57.04
1950	57.66
1951	57.99
1952	58.61
1953	59.21
1954	59.8
1955	60.37
1956	60.94
1957	61.48
1958	62.02
1959	62.53
1960	63.04
1961	63.52
1962	64
1963	64.46
1964	64.92
1965	65.35
1966	65.77
1967	66.19
1968	66.58
1969	66.97
1970	67.35
1971	67.73
1972	68.12
1973	68.53
1974	68.98
1975	69.34
1976	69.64
1977	69.47
1978	69.95
1979	70.1
1980	70.19
1981	70.22
1982	70.21
1983	70.16
1984	70.04
1985	70.05
1986	70.17
1987	70.32
1988	70.44
1989	70.66
1990	70.86
1991	71.17
1992	71.23
1993	71.38
1994	71.38
1995	71.41
1996	71.42
1997	71.34
1998	71.27
1999	71.27
2000	71.23
2001	71.14
2002	71.02
2003	71.01
2004	70.59
2005	71.07
2006	71.16
2007	71.31
2008	71.37
2009	71.43
2010	71.34
2011	71.35
2012	71.31
2013	71.32
2014	71.33
2015	71.39
2016	71.62
2017	71.74
2018	71.86