Year	Years
1800	30.3
1801	30.3
1802	30.3
1803	30.3
1804	30.3
1805	30.3
1806	30.3
1807	30.3
1808	30.3
1809	30.3
1810	30.3
1811	30.3
1812	30.3
1813	30.3
1814	30.3
1815	30.3
1816	30.3
1817	30.3
1818	30.3
1819	30.3
1820	30.3
1821	30.3
1822	30.3
1823	30.3
1824	30.3
1825	30.3
1826	30.3
1827	30.3
1828	30.3
1829	30.3
1830	30.3
1831	30.3
1832	30.3
1833	30.3
1834	30.3
1835	30.3
1836	30.3
1837	30.3
1838	30.3
1839	30.3
1840	30.3
1841	30.3
1842	30.3
1843	30.3
1844	30.3
1845	30.3
1846	30.3
1847	30.3
1848	30.3
1849	30.3
1850	30.3
1851	30.3
1852	30.3
1853	30.3
1854	30.3
1855	30.3
1856	30.3
1857	30.3
1858	30.3
1859	30.3
1860	30.3
1861	30.3
1862	30.3
1863	30.3
1864	30.3
1865	30.3
1866	30.3
1867	30.3
1868	30.3
1869	30.3
1870	30.3
1871	30.31
1872	30.31
1873	30.32
1874	30.32
1875	30.33
1876	30.34
1877	30.34
1878	30.35
1879	30.36
1880	30.36
1881	30.37
1882	30.37
1883	30.38
1884	30.39
1885	30.39
1886	30.4
1887	30.41
1888	30.41
1889	30.42
1890	30.42
1891	30.43
1892	30.44
1893	30.44
1894	30.45
1895	30.46
1896	30.46
1897	30.47
1898	30.47
1899	30.48
1900	30.49
1901	30.49
1902	30.5
1903	30.51
1904	30.51
1905	30.52
1906	30.52
1907	30.53
1908	30.54
1909	30.54
1910	30.55
1911	30.56
1912	30.56
1913	30.57
1914	30.57
1915	30.58
1916	30.59
1917	30.59
1918	25.37
1919	30.61
1920	30.61
1921	30.62
1922	30.62
1923	30.63
1924	30.64
1925	30.64
1926	30.65
1927	30.65
1928	30.66
1929	30.67
1930	30.67
1931	30.68
1932	30.69
1933	30.69
1934	30.7
1935	30.7
1936	31.44
1937	32.19
1938	32.92
1939	33.67
1940	34.41
1941	35.16
1942	35.89
1943	36.63
1944	37.38
1945	38.12
1946	38.87
1947	39.61
1948	40.36
1949	41.1
1950	41.84
1951	42.27
1952	43.18
1953	44.15
1954	45.2
1955	46.32
1956	47.5
1957	48.76
1958	50.07
1959	51.43
1960	52.83
1961	54.23
1962	55.62
1963	56.98
1964	58.28
1965	59.53
1966	60.7
1967	61.81
1968	62.85
1969	63.83
1970	64.75
1971	65.43
1972	66.01
1973	66.71
1974	67.33
1975	67.79
1976	68.36
1977	68.88
1978	69.36
1979	69.88
1980	70.36
1981	70.95
1982	70.9
1983	70.7
1984	70.53
1985	70.85
1986	70.36
1987	70.01
1988	69.85
1989	69.84
1990	69.76
1991	69.59
1992	69.61
1993	69.87
1994	70.18
1995	70.32
1996	70.79
1997	71.2
1998	71.5
1999	71.84
2000	71.67
2001	72.26
2002	72.59
2003	72.87
2004	73.14
2005	73.61
2006	73.85
2007	74.62
2008	75.19
2009	75.67
2010	76.03
2011	76.2
2012	76.32
2013	76.58
2014	76.69
2015	76.79
2016	76.9
2017	77.04
2018	77.18