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	28
1829	27
1830	26
1831	27
1832	29.7
1833	29.7
1834	29.7
1835	28
1836	27
1837	26
1838	27
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	26
1865	25
1866	24
1867	29.7
1868	29.7
1869	29.7
1870	29.7
1871	29.71
1872	29.71
1873	29.72
1874	29.72
1875	29.73
1876	29.73
1877	29.74
1878	29.74
1879	29.75
1880	27.05
1881	26.05
1882	29.76
1883	29.77
1884	29.77
1885	29.78
1886	29.79
1887	29.79
1888	17.06
1889	5.02
1890	4.01
1891	8.03
1892	14.06
1893	29.82
1894	29.83
1895	29.63
1896	28.83
1897	29.84
1898	29.85
1899	29.86
1900	29.86
1901	29.87
1902	29.87
1903	29.88
1904	29.88
1905	29.89
1906	29.89
1907	29.9
1908	29.9
1909	29.91
1910	29.91
1911	29.92
1912	29.92
1913	29.93
1914	29.94
1915	29.94
1916	29.95
1917	29.95
1918	11.59
1919	29.96
1920	29.97
1921	29.97
1922	29.98
1923	29.98
1924	29.99
1925	29.99
1926	30
1927	30
1928	30.01
1929	30.02
1930	30.02
1931	30.03
1932	30.03
1933	30.04
1934	30.04
1935	27.82
1936	23.27
1937	29.35
1938	29.36
1939	29.36
1940	28.35
1941	28.36
1942	30.09
1943	30.09
1944	30.1
1945	30.1
1946	30.84
1947	31.57
1948	32.31
1949	33.04
1950	33.78
1951	33.96
1952	34.33
1953	34.76
1954	35.25
1955	35.78
1956	36.36
1957	33.52
1958	31.49
1959	38.34
1960	39.04
1961	39.72
1962	40.37
1963	40.96
1964	40.88
1965	39.67
1966	40.69
1967	42.76
1968	43.11
1969	43.42
1970	43.72
1971	43.81
1972	43.98
1973	43.53
1974	43.51
1975	43.64
1976	43.45
1977	43.52
1978	43.57
1979	44.46
1980	44.62
1981	44.79
1982	45.04
1983	40.91
1984	41.35
1985	45.88
1986	46.44
1987	46.99
1988	47.34
1989	47.07
1990	46.63
1991	48.22
1992	48.92
1993	49.33
1994	49.63
1995	49.89
1996	50.55
1997	51.04
1998	51.49
1999	51.11
2000	51.14
2001	53.11
2002	53.89
2003	54.55
2004	55.33
2005	56.11
2006	57.06
2007	58.2
2008	59.39
2009	60.4
2010	61.3
2011	62.24
2012	63.08
2013	63.87
2014	64.64
2015	65.15
2016	65.64
2017	66.04
2018	66.42