Year	Years
1800	25.4
1801	25.4
1802	25.4
1803	25.4
1804	25.4
1805	25.4
1806	25.4
1807	25.4
1808	25.4
1809	25.4
1810	25.4
1811	25.4
1812	25.4
1813	25.4
1814	25.4
1815	25.4
1816	25.4
1817	25.4
1818	25.4
1819	25.4
1820	25.4
1821	25.4
1822	25.4
1823	25.4
1824	25.4
1825	25.4
1826	25.4
1827	25.4
1828	25.4
1829	25.4
1830	25.4
1831	25.4
1832	25.4
1833	25.4
1834	25.4
1835	25.4
1836	25.4
1837	25.4
1838	25.4
1839	25.4
1840	25.4
1841	25.4
1842	25.4
1843	25.4
1844	25.4
1845	25.4
1846	25.4
1847	25.4
1848	25.4
1849	25.4
1850	25.4
1851	25.4
1852	25.4
1853	25.4
1854	25.4
1855	25.4
1856	25.4
1857	25.4
1858	25.4
1859	25.4
1860	25.4
1861	25.4
1862	25.4
1863	25.4
1864	25.4
1865	25.4
1866	25.4
1867	25.4
1868	25.4
1869	25.4
1870	25.4
1871	25.45
1872	25.5
1873	25.54
1874	25.59
1875	25.64
1876	25.69
1877	25.73
1878	25.78
1879	25.83
1880	25.88
1881	25.93
1882	25.97
1883	26.02
1884	26.07
1885	26.12
1886	26.16
1887	26.21
1888	26.26
1889	26.31
1890	26.36
1891	26.4
1892	26.45
1893	26.5
1894	26.55
1895	26.59
1896	26.64
1897	26.69
1898	26.74
1899	26.79
1900	26.83
1901	26.88
1902	26.93
1903	26.98
1904	27.02
1905	27.07
1906	27.12
1907	27.17
1908	27.22
1909	27.26
1910	27.31
1911	27.36
1912	27.41
1913	27.45
1914	27.5
1915	27.55
1916	27.6
1917	27.65
1918	1.09
1919	27.74
1920	27.79
1921	27.84
1922	27.88
1923	27.93
1924	27.98
1925	28.03
1926	28.08
1927	28.12
1928	28.17
1929	28.22
1930	28.27
1931	28.31
1932	28.36
1933	28.41
1934	28.46
1935	29.87
1936	31.3
1937	32.71
1938	34.14
1939	35.58
1940	37.02
1941	38.45
1942	39.9
1943	41.35
1944	42.81
1945	44.26
1946	45.73
1947	47.2
1948	48.68
1949	50.15
1950	51.63
1951	52.02
1952	52.71
1953	53.4
1954	54.09
1955	54.77
1956	55.45
1957	56.14
1958	56.82
1959	57.5
1960	58.17
1961	58.85
1962	59.53
1963	60.22
1964	60.91
1965	61.6
1966	62.3
1967	62.99
1968	63.68
1969	64.39
1970	65.09
1971	65.15
1972	65.16
1973	65.09
1974	65.14
1975	65.6
1976	66.14
1977	66.5
1978	66.94
1979	67.21
1980	67.54
1981	67.67
1982	67.8
1983	67.93
1984	68.07
1985	68.22
1986	68.4
1987	68.59
1988	68.75
1989	68.93
1990	69.08
1991	69.02
1992	69.35
1993	69.49
1994	69.61
1995	69.74
1996	69.91
1997	70.07
1998	70.25
1999	70.33
2000	70.45
2001	70.6
2002	70.75
2003	70.89
2004	71.02
2005	71.16
2006	71.3
2007	71.33
2008	71.43
2009	69.39
2010	71.46
2011	71.46
2012	71.36
2013	71.59
2014	71.64
2015	71.72
2016	71.95
2017	72.17
2018	72.38