Year	Years
1800	30.6
1801	30.6
1802	30.6
1803	30.6
1804	30.6
1805	30.6
1806	30.6
1807	30.6
1808	30.6
1809	30.6
1810	30.6
1811	30.6
1812	30.6
1813	30.6
1814	30.6
1815	30.6
1816	30.6
1817	30.6
1818	30.6
1819	30.6
1820	30.6
1821	30.6
1822	30.6
1823	30.6
1824	30.6
1825	30.6
1826	30.6
1827	30.6
1828	30.6
1829	30.6
1830	30.6
1831	30.6
1832	30.6
1833	30.6
1834	30.6
1835	30.6
1836	30.6
1837	30.6
1838	30.6
1839	30.6
1840	30.6
1841	30.6
1842	30.6
1843	30.6
1844	30.6
1845	30.6
1846	30.6
1847	30.6
1848	30.6
1849	30.6
1850	30.6
1851	30.6
1852	30.6
1853	30.6
1854	30.6
1855	30.6
1856	30.6
1857	30.6
1858	30.6
1859	30.6
1860	30.6
1861	30.6
1862	30.6
1863	30.6
1864	30.6
1865	30.6
1866	30.6
1867	30.6
1868	30.6
1869	30.6
1870	30.6
1871	30.6
1872	30.6
1873	30.6
1874	30.6
1875	30.6
1876	30.6
1877	30.6
1878	30.61
1879	30.61
1880	30.61
1881	30.61
1882	30.61
1883	30.61
1884	30.61
1885	30.61
1886	30.61
1887	30.61
1888	30.61
1889	30.61
1890	30.61
1891	30.61
1892	30.62
1893	30.62
1894	30.62
1895	30.62
1896	30.62
1897	30.62
1898	30.62
1899	30.62
1900	30.62
1901	30.62
1902	30.62
1903	30.62
1904	30.62
1905	30.62
1906	30.63
1907	30.63
1908	30.63
1909	30.63
1910	30.63
1911	30.63
1912	30.63
1913	30.63
1914	30.63
1915	30.63
1916	30.63
1917	30.63
1918	19.63
1919	30.63
1920	30.64
1921	30.64
1922	30.64
1923	30.64
1924	30.64
1925	30.64
1926	30.64
1927	30.64
1928	30.64
1929	30.64
1930	30.64
1931	31.78
1932	32.94
1933	34.08
1934	35.23
1935	36.37
1936	37.53
1937	38.67
1938	39.81
1939	40.96
1940	42.11
1941	41.87
1942	36.16
1943	38.56
1944	38.37
1945	38.17
1946	45.08
1947	48.08
1948	50.59
1949	52.09
1950	53.59
1951	53.92
1952	54.57
1953	55.23
1954	55.88
1955	56.51
1956	57.14
1957	57.77
1958	58.39
1959	58.99
1960	59.59
1961	60.17
1962	60.74
1963	61.28
1964	61.8
1965	62.32
1966	62.8
1967	63.27
1968	63.72
1969	64.17
1970	64.6
1971	65.09
1972	65.6
1973	66.07
1974	66.51
1975	66.9
1976	67.36
1977	67.51
1978	68.13
1979	68.56
1980	68.92
1981	69.24
1982	69.57
1983	69.88
1984	70.2
1985	70.54
1986	70.84
1987	71.04
1988	71.21
1989	71.42
1990	71.66
1991	71.83
1992	71.99
1993	72.12
1994	72.22
1995	72.36
1996	72.53
1997	72.71
1998	72.83
1999	72.94
2000	73.12
2001	73.28
2002	73.38
2003	73.54
2004	73.74
2005	73.91
2006	74.06
2007	74.15
2008	74.25
2009	74.34
2010	74.46
2011	74.58
2012	74.72
2013	74.9
2014	75.1
2015	75.37
2016	75.61
2017	75.76
2018	75.91