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	25.42
1872	25.44
1873	25.47
1874	25.49
1875	25.51
1876	25.53
1877	25.56
1878	25.58
1879	25.6
1880	25.62
1881	25.65
1882	25.67
1883	25.69
1884	25.71
1885	25.74
1886	25.76
1887	25.78
1888	25.8
1889	25.83
1890	25.85
1891	25.87
1892	25.89
1893	25.92
1894	25.94
1895	25.96
1896	25.98
1897	26.01
1898	26.03
1899	26.05
1900	26.07
1901	26.09
1902	26.12
1903	26.14
1904	26.16
1905	26.18
1906	26.21
1907	26.23
1908	26.25
1909	26.27
1910	26.3
1911	26.32
1912	26.34
1913	26.36
1914	26.39
1915	26.41
1916	26.43
1917	26.23
1918	23.21
1919	25.84
1920	25.64
1921	25.45
1922	26.02
1923	26.61
1924	27.19
1925	27.76
1926	28.34
1927	28.94
1928	29.52
1929	30.1
1930	30.68
1931	31.28
1932	31.86
1933	32.45
1934	33.04
1935	33.63
1936	34.22
1937	34.81
1938	35.41
1939	36.01
1940	36.6
1941	37.33
1942	38.06
1943	38.79
1944	39.52
1945	40.26
1946	41
1947	41.73
1948	42.46
1949	43.2
1950	43.95
1951	44.32
1952	45.02
1953	45.72
1954	46.42
1955	47.13
1956	47.84
1957	48.57
1958	49.29
1959	50.02
1960	50.76
1961	51.51
1962	52.25
1963	53
1964	53.76
1965	54.52
1966	55.3
1967	56.07
1968	56.87
1969	57.65
1970	58.42
1971	59.72
1972	52.16
1973	62.47
1974	63.64
1975	64.49
1976	65.21
1977	66.12
1978	64.88
1979	60.91
1980	67.51
1981	67.58
1982	67.79
1983	65.44
1984	64.8
1985	65.3
1986	66.84
1987	66.94
1988	70.09
1989	72.74
1990	73.58
1991	73.7
1992	73.44
1993	73.33
1994	73.59
1995	73.74
1996	74.04
1997	74.4
1998	72.65
1999	75.21
2000	75.62
2001	75.88
2002	76.04
2003	76.14
2004	76.3
2005	76.58
2006	76.87
2007	77.04
2008	77.29
2009	77.35
2010	77.36
2011	77.48
2012	77.54
2013	77.62
2014	77.75
2015	77.97
2016	78.21
2017	78.47
2018	78.72