Year	Years
1800	30.9
1801	30.9
1802	30.9
1803	30.9
1804	30.9
1805	30.9
1806	30.9
1807	30.9
1808	30.9
1809	30.9
1810	30.9
1811	30.9
1812	30.9
1813	30.9
1814	30.9
1815	30.9
1816	30.9
1817	30.9
1818	30.9
1819	30.9
1820	30.9
1821	30.9
1822	30.9
1823	30.9
1824	30.9
1825	30.9
1826	30.9
1827	30.9
1828	30.9
1829	30.9
1830	30.9
1831	30.9
1832	30.9
1833	30.9
1834	30.9
1835	30.9
1836	30.9
1837	30.9
1838	30.9
1839	30.9
1840	30.9
1841	30.9
1842	30.9
1843	30.9
1844	30.9
1845	30.9
1846	30.9
1847	30.9
1848	30.9
1849	30.9
1850	30.9
1851	30.9
1852	30.9
1853	30.9
1854	30.9
1855	30.9
1856	30.9
1857	30.9
1858	30.9
1859	30.9
1860	30.9
1861	30.9
1862	30.9
1863	30.9
1864	30.9
1865	30.9
1866	30.9
1867	30.9
1868	30.9
1869	30.9
1870	30.9
1871	30.96
1872	31.02
1873	31.08
1874	31.13
1875	31.19
1876	31.25
1877	31.31
1878	31.37
1879	31.43
1880	31.49
1881	31.55
1882	31.6
1883	31.66
1884	31.72
1885	31.78
1886	31.84
1887	31.9
1888	31.96
1889	32.02
1890	32.07
1891	32.13
1892	32.19
1893	32.25
1894	32.31
1895	32.37
1896	32.43
1897	32.49
1898	32.54
1899	32.6
1900	32.66
1901	32.72
1902	32.78
1903	32.84
1904	32.9
1905	32.96
1906	33.01
1907	33.07
1908	33.13
1909	33.19
1910	33.25
1911	33.31
1912	33.37
1913	33.43
1914	33.48
1915	33.54
1916	33.6
1917	33.66
1918	19.75
1919	33.78
1920	33.84
1921	33.89
1922	33.95
1923	34.01
1924	34.07
1925	34.13
1926	34.19
1927	34.25
1928	34.31
1929	34.36
1930	34.42
1931	34.48
1932	34.54
1933	34.6
1934	34.66
1935	34.72
1936	34.78
1937	34.83
1938	34.89
1939	34.95
1940	35.01
1941	35.07
1942	35.13
1943	35.19
1944	35.25
1945	35.3
1946	36.43
1947	37.55
1948	38.68
1949	39.82
1950	40.97
1951	41.17
1952	41.53
1953	41.9
1954	42.26
1955	42.63
1956	43.01
1957	43.39
1958	43.77
1959	44.15
1960	44.52
1961	44.9
1962	45.28
1963	45.66
1964	46.05
1965	46.45
1966	46.91
1967	47.41
1968	47.97
1969	48.56
1970	49.18
1971	48.97
1972	49.85
1973	50.72
1974	50.89
1975	51.21
1976	50.83
1977	51.05
1978	51.31
1979	51.29
1980	51.23
1981	50.94
1982	50.86
1983	51.12
1984	51.47
1985	52.4
1986	52.32
1987	51.21
1988	53.5
1989	53.56
1990	53.26
1991	53.45
1992	53.46
1993	53.62
1994	53.43
1995	53.45
1996	52.99
1997	52.73
1998	52.44
1999	52.37
2000	52.16
2001	52.44
2002	52.59
2003	52.76
2004	53.11
2005	53.85
2006	54.06
2007	54.88
2008	55.18
2009	55.91
2010	56.49
2011	56.97
2012	57.53
2013	58.16
2014	58.68
2015	59.19
2016	59.84
2017	60.18
2018	60.52