Year	Years
1800	38.3
1801	38.3
1802	38.3
1803	38.3
1804	38.3
1805	38.3
1806	38.3
1807	38.3
1808	38.3
1809	38.3
1810	38.3
1811	38.3
1812	38.3
1813	38.3
1814	38.3
1815	38.3
1816	38.3
1817	38.3
1818	38.3
1819	38.3
1820	38.3
1821	38.3
1822	38.3
1823	38.3
1824	38.3
1825	38.3
1826	38.3
1827	38.3
1828	38.3
1829	38.3
1830	38.3
1831	38.3
1832	38.3
1833	38.3
1834	38.3
1835	38.3
1836	38.3
1837	38.3
1838	38.3
1839	38.3
1840	38.3
1841	38.3
1842	38.3
1843	38.3
1844	38.3
1845	38.3
1846	19.8
1847	24
1848	14.9
1849	14.1
1850	31.2
1851	38.3
1852	38.3
1853	38.3
1854	38.3
1855	38.3
1856	38.3
1857	38.3
1858	38.3
1859	38.3
1860	38.56
1861	38.83
1862	39.09
1863	39.36
1864	39.62
1865	39.89
1866	40.15
1867	40.41
1868	40.68
1869	40.94
1870	41.21
1871	41.47
1872	41.74
1873	42
1874	42.27
1875	42.54
1876	42.8
1877	43.07
1878	43.33
1879	43.61
1880	43.87
1881	44.13
1882	44.4
1883	44.66
1884	44.93
1885	45.2
1886	45.47
1887	45.73
1888	45.99
1889	46.26
1890	46.53
1891	46.8
1892	47.06
1893	47.33
1894	47.59
1895	47.86
1896	48.13
1897	48.39
1898	48.66
1899	48.93
1900	49.2
1901	49.46
1902	49.9
1903	50.34
1904	50.79
1905	51.23
1906	51.67
1907	52.12
1908	52.56
1909	53
1910	53.44
1911	53.89
1912	54.14
1913	54.4
1914	54.65
1915	54.91
1916	55.17
1917	55.42
1918	49.77
1919	55.94
1920	56.19
1921	56.44
1922	56.7
1923	56.96
1924	57.21
1925	57.47
1926	57.73
1927	57.86
1928	57.99
1929	58.12
1930	58.26
1931	58.39
1932	58.52
1933	58.65
1934	58.79
1935	58.92
1936	59.05
1937	59.27
1938	59.5
1939	59.72
1940	59.94
1941	60.17
1942	60.45
1943	60.73
1944	61.02
1945	61.3
1946	61.58
1947	62.64
1948	63.7
1949	64.76
1950	65.81
1951	64.98
1952	67.41
1953	68.18
1954	68.29
1955	68.29
1956	69.24
1957	69.29
1958	69.6
1959	69.73
1960	70.48
1961	69.94
1962	70.24
1963	70.49
1964	70.75
1965	70.95
1966	70.46
1967	71.51
1968	71.2
1969	71.12
1970	71.17
1971	71.31
1972	71.25
1973	71.25
1974	71.39
1975	71.68
1976	71.99
1977	72.13
1978	72.15
1979	72.31
1980	72.66
1981	72.97
1982	73.17
1983	73.3
1984	73.57
1985	73.85
1986	74.07
1987	74.38
1988	74.53
1989	74.69
1990	74.91
1991	75.16
1992	75.35
1993	75.54
1994	75.73
1995	75.8
1996	76
1997	76.08
1998	76.22
1999	76.36
2000	76.65
2001	77.14
2002	77.65
2003	78.12
2004	78.51
2005	78.91
2006	79.25
2007	79.58
2008	79.75
2009	79.94
2010	80.38
2011	80.54
2012	80.76
2013	80.96
2014	81.1
2015	81.12
2016	81.15
2017	81.32
2018	81.49