Year	Years
1800	24
1801	24
1802	24
1803	24
1804	24
1805	24
1806	24
1807	24
1808	24
1809	24
1810	24
1811	24
1812	24
1813	24
1814	24
1815	24
1816	24
1817	24
1818	24
1819	24
1820	24
1821	24
1822	24
1823	24
1824	24
1825	24
1826	24
1827	24
1828	24
1829	24
1830	24
1831	24
1832	24
1833	24
1834	24
1835	24
1836	24
1837	24
1838	24
1839	24
1840	24
1841	24
1842	24
1843	24
1844	24
1845	24
1846	24
1847	24
1848	24
1849	24
1850	24
1851	24
1852	24
1853	24
1854	24
1855	24
1856	24
1857	24
1858	24
1859	24
1860	24
1861	24
1862	24
1863	24
1864	23.17
1865	22.33
1866	21.5
1867	20.67
1868	19.84
1869	19.88
1870	19.92
1871	19.96
1872	19.99
1873	20.03
1874	20.22
1875	20.41
1876	20.61
1877	20.8
1878	20.99
1879	21.18
1880	21.37
1881	21.55
1882	21.74
1883	21.93
1884	22.12
1885	22.31
1886	22.5
1887	22.69
1888	22.88
1889	23.06
1890	23.25
1891	23.44
1892	23.63
1893	23.82
1894	24
1895	24.19
1896	24.38
1897	24.56
1898	24.38
1899	24.21
1900	24.04
1901	24.27
1902	24.51
1903	24.74
1904	24.98
1905	25.21
1906	25.45
1907	25.68
1908	25.92
1909	26.15
1910	26.39
1911	29.27
1912	29.68
1913	27.54
1914	27.12
1915	26.72
1916	26.71
1917	23.76
1918	13.96
1919	19.3
1920	14.89
1921	18.11
1922	18.98
1923	27.67
1924	30.1
1925	29.2
1926	32.31
1927	31.64
1928	33.1
1929	31.88
1930	31.19
1931	25.55
1932	17.76
1933	13.86
1934	33.44
1935	34.93
1936	36.53
1937	35.56
1938	37.18
1939	39.49
1940	37.08
1941	26.64
1942	22.75
1943	21.78
1944	29.5
1945	36.74
1946	43.74
1947	35.99
1948	43.77
1949	46.45
1950	48.65
1951	48.83
1952	49.22
1953	49.61
1954	50
1955	50.39
1956	50.78
1957	51.16
1958	51.54
1959	51.92
1960	52.3
1961	52.69
1962	53.07
1963	53.46
1964	53.85
1965	54.23
1966	54.6
1967	54.95
1968	55.29
1969	55.6
1970	55.89
1971	56.51
1972	57.06
1973	57.63
1974	58.17
1975	58.68
1976	59.2
1977	59.71
1978	60.22
1979	60.71
1980	61.21
1981	61.68
1982	62.06
1983	62.28
1984	62.59
1985	62.93
1986	63.16
1987	63.37
1988	63.49
1989	63.6
1990	63.7
1991	63.67
1992	63.55
1993	63.39
1994	63.19
1995	63.12
1996	63.07
1997	63.04
1998	63.13
1999	63.32
2000	63.69
2001	64.02
2002	64.3
2003	64.6
2004	64.93
2005	65.35
2006	65.84
2007	66.35
2008	66.87
2009	67.43
2010	67.94
2011	68.39
2012	68.84
2013	69.19
2014	69.57
2015	69.9
2016	70.24
2017	70.36
2018	70.48