Year	Years
1800	29.7
1801	29.7
1802	29.7
1803	29.7
1804	29.7
1805	29.7
1806	29.7
1807	29.7
1808	29.7
1809	29.7
1810	29.7
1811	29.7
1812	29.7
1813	29.7
1814	29.7
1815	29.7
1816	29.7
1817	29.7
1818	29.7
1819	29.7
1820	29.7
1821	29.7
1822	29.7
1823	29.7
1824	29.7
1825	29.7
1826	29.7
1827	29.7
1828	29.7
1829	29.7
1830	29.7
1831	29.7
1832	29.7
1833	29.7
1834	29.7
1835	29.7
1836	29.7
1837	29.7
1838	29.7
1839	29.7
1840	29.7
1841	29.7
1842	29.7
1843	29.7
1844	29.7
1845	29.7
1846	29.7
1847	29.7
1848	29.7
1849	29.7
1850	29.7
1851	29.7
1852	29.7
1853	29.7
1854	29.7
1855	29.7
1856	29.7
1857	29.7
1858	29.7
1859	29.7
1860	29.7
1861	29.7
1862	29.7
1863	29.7
1864	29.7
1865	29.7
1866	29.7
1867	29.7
1868	29.7
1869	29.7
1870	29.7
1871	29.7
1872	29.7
1873	29.71
1874	29.71
1875	29.71
1876	29.71
1877	29.72
1878	29.72
1879	29.72
1880	29.72
1881	29.73
1882	29.73
1883	29.73
1884	29.73
1885	29.74
1886	29.74
1887	29.74
1888	29.74
1889	29.75
1890	29.75
1891	29.75
1892	29.75
1893	29.76
1894	29.76
1895	29.76
1896	29.76
1897	29.76
1898	29.77
1899	29.77
1900	29.77
1901	29.77
1902	29.78
1903	29.78
1904	29.78
1905	29.78
1906	29.79
1907	29.79
1908	29.79
1909	29.79
1910	29.8
1911	29.8
1912	29.8
1913	29.8
1914	29.81
1915	29.81
1916	29.81
1917	29.81
1918	24.72
1919	29.82
1920	29.82
1921	29.82
1922	29.83
1923	29.83
1924	29.83
1925	29.83
1926	29.83
1927	29.84
1928	29.84
1929	29.84
1930	29.84
1931	29.85
1932	29.85
1933	29.85
1934	29.85
1935	29.86
1936	29.86
1937	29.86
1938	29.86
1939	29.87
1940	29.87
1941	32.88
1942	35.89
1943	38.9
1944	41.9
1945	44.91
1946	47.92
1947	50.94
1948	53.95
1949	56.96
1950	59.98
1951	60.2
1952	60.66
1953	61.1
1954	61.53
1955	61.93
1956	62.32
1957	62.7
1958	63.06
1959	63.4
1960	63.73
1961	64.05
1962	64.35
1963	64.64
1964	64.93
1965	65.21
1966	65.49
1967	65.77
1968	66.05
1969	66.33
1970	66.61
1971	66.76
1972	67.07
1973	67.34
1974	67.89
1975	59.65
1976	34.93
1977	52.7
1978	52.8
1979	52.9
1980	53.15
1981	53.35
1982	45.93
1983	63.67
1984	63.98
1985	64.35
1986	64.61
1987	54.54
1988	54.63
1989	69.7
1990	69.15
1991	71.7
1992	72.01
1993	72.33
1994	73.1
1995	73.53
1996	74.05
1997	74.71
1998	75.29
1999	76.01
2000	76.45
2001	76.98
2002	77.37
2003	77.7
2004	78.02
2005	78.28
2006	77.97
2007	78.66
2008	79.14
2009	79.48
2010	79.85
2011	79.03
2012	80.19
2013	79.96
2014	80.03
2015	80.08
2016	80.11
2017	80.28
2018	80.45