Year	Years
1800	28.3
1801	28.3
1802	28.3
1803	28.3
1804	28.3
1805	28.3
1806	28.3
1807	28.3
1808	28.3
1809	28.3
1810	28.3
1811	28.3
1812	28.3
1813	28.3
1814	28.3
1815	28.3
1816	28.3
1817	28.3
1818	28.3
1819	28.3
1820	28.3
1821	28.3
1822	28.3
1823	28.3
1824	28.3
1825	28.3
1826	28.3
1827	28.3
1828	28.3
1829	28.3
1830	28.3
1831	28.3
1832	28.3
1833	28.3
1834	28.3
1835	28.3
1836	28.3
1837	28.3
1838	28.3
1839	28.3
1840	28.3
1841	28.3
1842	28.3
1843	28.3
1844	28.3
1845	28.3
1846	28.3
1847	28.3
1848	28.3
1849	28.3
1850	28.3
1851	28.3
1852	28.3
1853	28.3
1854	28.3
1855	28.3
1856	28.3
1857	28.3
1858	28.3
1859	28.3
1860	28.3
1861	28.3
1862	28.3
1863	28.3
1864	28.3
1865	28.3
1866	28.3
1867	28.3
1868	28.3
1869	28.3
1870	28.3
1871	28.3
1872	28.3
1873	28.3
1874	28.3
1875	28.31
1876	28.31
1877	28.31
1878	28.31
1879	28.31
1880	28.31
1881	28.31
1882	28.31
1883	28.32
1884	28.32
1885	28.32
1886	28.32
1887	28.32
1888	28.32
1889	28.32
1890	28.32
1891	28.32
1892	28.33
1893	28.33
1894	28.33
1895	28.33
1896	28.33
1897	28.33
1898	28.33
1899	28.33
1900	28.33
1901	28.34
1902	28.34
1903	28.34
1904	28.34
1905	28.34
1906	28.34
1907	29.54
1908	30.95
1909	31.85
1910	33.96
1911	33.96
1912	34.06
1913	33.36
1914	31.96
1915	28.55
1916	30.06
1917	31.46
1918	26.15
1919	31.26
1920	27.66
1921	30.06
1922	36.68
1923	35.38
1924	37.18
1925	34.28
1926	37.09
1927	39.69
1928	40.4
1929	41
1930	41.6
1931	41.3
1932	41.41
1933	42.11
1934	42.71
1935	42.91
1936	42.11
1937	42.62
1938	43.82
1939	43.72
1940	43.93
1941	45.13
1942	44.63
1943	44.33
1944	43.63
1945	41.83
1946	43.64
1947	46.15
1948	50.16
1949	52.67
1950	54.78
1951	55.28
1952	58.7
1953	60.51
1954	62.21
1955	62.62
1956	62.72
1957	62.62
1958	64.43
1959	64.44
1960	64.64
1961	65.14
1962	65.45
1963	66.25
1964	66.96
1965	67.66
1966	67.67
1967	67.77
1968	67.87
1969	68.88
1970	68.93
1971	69.43
1972	69.86
1973	70.17
1974	70.54
1975	70.97
1976	71.3
1977	71.5
1978	71.75
1979	71.83
1980	71.84
1981	71.96
1982	72.3
1983	72.55
1984	72.93
1985	73.22
1986	73.45
1987	73.65
1988	73.7
1989	73.89
1990	74.2
1991	74.53
1992	74.7
1993	74.88
1994	74.98
1995	74.94
1996	75.12
1997	75.44
1998	75.69
1999	75.68
2000	76.33
2001	76.69
2002	77.04
2003	77.34
2004	77.49
2005	77.67
2006	78.05
2007	78.36
2008	78.63
2009	78.88
2010	79.19
2011	79.3
2012	79.48
2013	79.69
2014	79.74
2015	79.76
2016	79.76