Year	Years
1800	29
1801	29
1802	29
1803	29
1804	29
1805	29
1806	29
1807	29
1808	29
1809	29
1810	29
1811	29
1812	29
1813	29
1814	29
1815	29
1816	29
1817	29
1818	29
1819	29
1820	29
1821	29
1822	29
1823	29
1824	29
1825	29
1826	29
1827	29
1828	29
1829	29
1830	29
1831	29
1832	29
1833	29
1834	29
1835	29
1836	29
1837	29
1838	29
1839	29
1840	29
1841	29
1842	29
1843	29
1844	29
1845	29
1846	29
1847	29
1848	29
1849	29
1850	29
1851	29
1852	29
1853	29
1854	29
1855	29
1856	29
1857	29
1858	29
1859	29
1860	29
1861	29
1862	29
1863	29
1864	29
1865	29
1866	29
1867	29
1868	29
1869	29
1870	29
1871	28.99
1872	28.98
1873	28.97
1874	28.96
1875	28.95
1876	28.94
1877	28.93
1878	28.92
1879	28.91
1880	28.9
1881	28.89
1882	28.88
1883	28.87
1884	28.86
1885	28.85
1886	28.84
1887	28.83
1888	28.82
1889	28.81
1890	28.8
1891	28.79
1892	28.78
1893	28.77
1894	28.76
1895	28.75
1896	28.74
1897	28.73
1898	28.72
1899	28.71
1900	28.7
1901	28.69
1902	28.68
1903	28.67
1904	28.67
1905	28.66
1906	28.65
1907	28.64
1908	28.63
1909	28.62
1910	28.61
1911	28.6
1912	28.59
1913	28.58
1914	28.57
1915	28.56
1916	28.55
1917	28.54
1918	18.5
1919	28.52
1920	28.51
1921	28.5
1922	28.49
1923	28.48
1924	28.47
1925	28.46
1926	28.45
1927	28.44
1928	28.43
1929	28.42
1930	28.41
1931	28.4
1932	28.39
1933	28.38
1934	28.37
1935	28.36
1936	28.35
1937	28.34
1938	28.33
1939	28.32
1940	28.31
1941	28.3
1942	28.29
1943	29.17
1944	30.05
1945	30.92
1946	31.79
1947	32.66
1948	33.54
1949	34.41
1950	35.28
1951	35.59
1952	36.22
1953	36.84
1954	37.45
1955	38.04
1956	38.63
1957	39.21
1958	39.76
1959	40.32
1960	40.88
1961	41.43
1962	41.98
1963	42.51
1964	43.04
1965	43.56
1966	44.04
1967	44.47
1968	44.88
1969	45.26
1970	45.6
1971	45.97
1972	46.39
1973	47.06
1974	47.76
1975	48.26
1976	48.67
1977	49.01
1978	49.35
1979	49.81
1980	50.35
1981	50.97
1982	51.43
1983	51.79
1984	52.12
1985	52.46
1986	52.76
1987	53.26
1988	53.66
1989	53.79
1990	54.06
1991	54.21
1992	54.55
1993	54.18
1994	54.6
1995	55.12
1996	55.47
1997	55.7
1998	56.05
1999	56.38
2000	56.8
2001	57.13
2002	57.46
2003	57.61
2004	56.61
2005	58.03
2006	58.35
2007	58.87
2008	59.3
2009	60.04
2010	32.11
2011	60.54
2012	61.63
2013	62.51
2014	63.3
2015	63.88
2016	64
2017	64.27
2018	64.52