Year	Years
1800	30
1801	30
1802	30
1803	30
1804	30
1805	30
1806	30
1807	30
1808	30
1809	30
1810	30
1811	30
1812	30
1813	30
1814	30
1815	30
1816	30
1817	30
1818	30
1819	30
1820	30
1821	30
1822	30
1823	30
1824	30
1825	30
1826	30
1827	30
1828	30
1829	30
1830	30
1831	30
1832	30
1833	30
1834	30
1835	30
1836	30
1837	30
1838	30
1839	30
1840	30
1841	30
1842	30
1843	30
1844	30
1845	30
1846	30
1847	30
1848	30
1849	30
1850	30
1851	30
1852	30
1853	30
1854	30
1855	30
1856	30
1857	30
1858	30
1859	30
1860	30
1861	30
1862	30
1863	30
1864	30
1865	30
1866	30
1867	30
1868	30
1869	30
1870	30
1871	30.05
1872	30.09
1873	30.14
1874	30.18
1875	30.23
1876	30.27
1877	30.32
1878	30.36
1879	30.41
1880	30.45
1881	30.5
1882	30.54
1883	30.59
1884	30.63
1885	30.68
1886	30.72
1887	30.77
1888	30.81
1889	30.86
1890	30.9
1891	30.95
1892	30.99
1893	31.04
1894	31.08
1895	31.13
1896	31.17
1897	31.22
1898	31.26
1899	31.31
1900	31.35
1901	31.4
1902	31.44
1903	31.49
1904	31.53
1905	31.58
1906	31.62
1907	31.67
1908	31.72
1909	31.76
1910	31.81
1911	31.85
1912	31.9
1913	31.94
1914	31.99
1915	32.03
1916	32.08
1917	32.12
1918	12.44
1919	32.21
1920	32.26
1921	32.3
1922	32.35
1923	32.39
1924	32.44
1925	32.48
1926	32.53
1927	32.57
1928	32.62
1929	32.66
1930	32.71
1931	32.75
1932	32.8
1933	32.84
1934	32.89
1935	32.93
1936	32.98
1937	33.02
1938	33.07
1939	33.11
1940	33.16
1941	33.2
1942	33.25
1943	33.29
1944	33.34
1945	33.39
1946	33.43
1947	34.2
1948	34.98
1949	35.76
1950	36.53
1951	36.82
1952	37.33
1953	37.85
1954	38.36
1955	38.88
1956	39.38
1957	39.89
1958	40.4
1959	40.91
1960	41.43
1961	41.95
1962	42.5
1963	43.05
1964	43.64
1965	44.28
1966	44.95
1967	45.7
1968	46.49
1969	47.35
1970	48.26
1971	48.31
1972	48.3
1973	48.35
1974	48.37
1975	48.43
1976	48.57
1977	48.82
1978	49.05
1979	49.28
1980	49.63
1981	49.91
1982	50.19
1983	50.1
1984	50.05
1985	49.98
1986	49.83
1987	49.65
1988	49.05
1989	48.64
1990	48.21
1991	48.01
1992	47.84
1993	47.22
1994	46.75
1995	46.2
1996	45.63
1997	45.11
1998	44.92
1999	44.7
2000	44.48
2001	44.4
2002	44.52
2003	44.63
2004	44.77
2005	45.02
2006	45.32
2007	45.73
2008	46.34
2009	46.96
2010	47.48
2011	48.04
2012	48.63
2013	47.97
2014	48.35
2015	49.71
2016	50.25
2017	50.94
2018	51.58