Year	Years
1800	37
1801	37
1802	37
1803	37
1804	37
1805	37
1806	37
1807	37
1808	37
1809	37
1810	37
1811	37
1812	37
1813	37
1814	37
1815	37
1816	37
1817	37
1818	37
1819	37
1820	37
1821	37
1822	37
1823	37
1824	37
1825	37
1826	37
1827	37
1828	37
1829	37
1830	37
1831	37
1832	37
1833	37
1834	37
1835	37
1836	37
1837	37
1838	37
1839	37
1840	37
1841	37
1842	37
1843	37
1844	37
1845	37
1846	37
1847	37
1848	37
1849	37
1850	37
1851	37
1852	37
1853	37
1854	37
1855	37
1856	37
1857	37
1858	37
1859	37
1860	37
1861	37
1862	37
1863	37
1864	37
1865	37
1866	37
1867	37
1868	37
1869	37
1870	37
1871	37.26
1872	37.52
1873	37.79
1874	38.04
1875	38.3
1876	38.56
1877	38.83
1878	39.09
1879	39.34
1880	39.6
1881	39.87
1882	40.13
1883	40.39
1884	40.65
1885	40.91
1886	41.17
1887	41.43
1888	41.69
1889	41.96
1890	42.21
1891	42.47
1892	42.73
1893	43
1894	43.26
1895	43.51
1896	43.77
1897	44.04
1898	44.3
1899	44.56
1900	44.81
1901	45.08
1902	45.34
1903	45.6
1904	45.85
1905	46.11
1906	46.38
1907	46.64
1908	46.89
1909	47.15
1910	47.42
1911	47.68
1912	47.93
1913	48.19
1914	48.46
1915	48.72
1916	48.97
1917	49.23
1918	49.5
1919	49.76
1920	50.01
1921	50.27
1922	50.54
1923	50.8
1924	51.05
1925	51.31
1926	51.58
1927	51.83
1928	52.09
1929	52.35
1930	52.62
1931	52.87
1932	53.13
1933	53.39
1934	53.65
1935	53.91
1936	54.17
1937	54.42
1938	54.68
1939	54.95
1940	55.21
1941	55.46
1942	55.72
1943	55.99
1944	56.24
1945	56.5
1946	56.76
1947	57.02
1948	57.28
1949	57.54
1950	57.79
1951	57.73
1952	57.65
1953	57.7
1954	57.85
1955	58.13
1956	58.53
1957	59.02
1958	59.6
1959	60.23
1960	60.89
1961	61.52
1962	62.12
1963	62.63
1964	63.06
1965	63.42
1966	63.76
1967	64.11
1968	64.49
1969	64.92
1970	65.39
1971	65.89
1972	66.39
1973	67
1974	67.58
1975	68.04
1976	68.44
1977	68.81
1978	69.37
1979	69.96
1980	70.36
1981	70.78
1982	70.48
1983	70.72
1984	70.4
1985	69.85
1986	69.54
1987	69.43
1988	69.52
1989	69.25
1990	69.31
1991	69.36
1992	69.48
1993	69.52
1994	69.94
1995	70.4
1996	70.44
1997	70.59
1998	70.75
1999	70.97
2000	71.15
2001	71.31
2002	71.46
2003	71.6
2004	71.8
2005	72.07
2006	72.42
2007	72.74
2008	73.07
2009	73.24
2010	73.38
2011	73.5
2012	73.62
2013	73.66
2014	73.61
2015	73.7
2016	73.82
2017	74.03
2018	74.23