Year	Years
1800	33.9
1801	33.9
1802	33.9
1803	33.9
1804	33.9
1805	33.9
1806	33.9
1807	33.9
1808	33.9
1809	33.9
1810	33.9
1811	33.9
1812	33.9
1813	33.9
1814	33.9
1815	33.9
1816	33.9
1817	33.9
1818	33.9
1819	33.9
1820	33.9
1821	33.9
1822	33.9
1823	33.9
1824	33.9
1825	33.9
1826	33.9
1827	33.9
1828	33.9
1829	33.9
1830	33.9
1831	33.9
1832	33.9
1833	33.9
1834	33.9
1835	33.9
1836	33.9
1837	33.9
1838	33.9
1839	33.9
1840	33.9
1841	33.9
1842	33.9
1843	33.9
1844	33.9
1845	33.9
1846	33.9
1847	33.9
1848	33.9
1849	33.9
1850	33.9
1851	33.9
1852	33.9
1853	33.9
1854	33.9
1855	33.9
1856	33.9
1857	33.9
1858	33.9
1859	33.9
1860	33.9
1861	33.9
1862	33.9
1863	33.9
1864	33.9
1865	33.9
1866	33.9
1867	33.9
1868	33.9
1869	33.9
1870	33.9
1871	33.93
1872	33.96
1873	33.99
1874	34.02
1875	34.06
1876	34.09
1877	34.12
1878	34.15
1879	34.18
1880	34.21
1881	34.24
1882	34.27
1883	34.31
1884	34.34
1885	34.37
1886	34.4
1887	34.43
1888	34.46
1889	34.49
1890	34.52
1891	34.55
1892	34.59
1893	34.62
1894	34.65
1895	34.68
1896	34.71
1897	34.74
1898	34.77
1899	34.8
1900	34.83
1901	34.87
1902	34.9
1903	34.93
1904	34.96
1905	34.99
1906	35.02
1907	35.05
1908	35.08
1909	35.12
1910	35.15
1911	35.18
1912	35.21
1913	35.24
1914	35.27
1915	35.3
1916	35.33
1917	35.36
1918	31.29
1919	35.43
1920	35.46
1921	35.49
1922	35.52
1923	35.55
1924	35.58
1925	35.61
1926	35.64
1927	35.68
1928	35.71
1929	35.74
1930	35.77
1931	36.17
1932	36.56
1933	36.96
1934	37.37
1935	37.77
1936	38.16
1937	38.57
1938	38.97
1939	39.38
1940	39.77
1941	40.18
1942	40.59
1943	41
1944	41.4
1945	41.81
1946	42.22
1947	42.62
1948	43.03
1949	43.44
1950	43.85
1951	44.13
1952	44.65
1953	45.21
1954	45.81
1955	46.45
1956	47.12
1957	47.83
1958	48.56
1959	49.33
1960	50.1
1961	50.88
1962	51.65
1963	52.41
1964	53.15
1965	53.87
1966	54.56
1967	55.25
1968	55.94
1969	56.63
1970	57.34
1971	57.93
1972	58.7
1973	57.32
1974	54.53
1975	60.76
1976	60.79
1977	61.48
1978	62.15
1979	63.58
1980	64.12
1981	64.36
1982	64.54
1983	64.9
1984	65.19
1985	65.48
1986	65.77
1987	66.31
1988	66.64
1989	66.94
1990	67.29
1991	67.6
1992	67.84
1993	67.93
1994	68.34
1995	68.54
1996	68.8
1997	69.02
1998	63.04
1999	69.37
2000	69.57
2001	69.73
2002	69.91
2003	70.05
2004	70.3
2005	70.58
2006	70.84
2007	71.09
2008	71.27
2009	71.49
2010	71.58
2011	71.81
2012	71.84
2013	72.15
2014	72.32
2015	72.49
2016	72.68
2017	72.87
2018	73.06