Year	Years
1800	28.9
1801	28.9
1802	28.9
1803	28.9
1804	28.9
1805	28.9
1806	28.9
1807	28.9
1808	28.9
1809	28.9
1810	28.9
1811	28.9
1812	28.9
1813	28.9
1814	28.9
1815	28.9
1816	28.9
1817	28.9
1818	28.9
1819	28.9
1820	28.9
1821	28.9
1822	28.9
1823	28.9
1824	28.9
1825	28.9
1826	28.9
1827	28.9
1828	28.9
1829	28.9
1830	28.9
1831	28.9
1832	28.9
1833	28.9
1834	28.9
1835	28.9
1836	28.9
1837	28.9
1838	28.9
1839	28.9
1840	28.9
1841	28.9
1842	28.9
1843	28.9
1844	28.9
1845	28.9
1846	28.9
1847	28.9
1848	28.9
1849	28.9
1850	28.9
1851	28.9
1852	28.9
1853	28.9
1854	28.9
1855	28.9
1856	28.9
1857	28.9
1858	28.9
1859	28.9
1860	28.9
1861	28.9
1862	28.9
1863	28.9
1864	28.9
1865	28.9
1866	28.9
1867	28.9
1868	28.9
1869	28.9
1870	28.9
1871	29.33
1872	29.75
1873	30.18
1874	30.61
1875	31.03
1876	31.46
1877	31.89
1878	32.31
1879	32.74
1880	33.17
1881	33.59
1882	34.02
1883	34.45
1884	34.87
1885	35.3
1886	35.73
1887	36.15
1888	36.58
1889	37.01
1890	37.43
1891	37.86
1892	38.29
1893	38.71
1894	39.14
1895	39.57
1896	39.99
1897	40.42
1898	40.85
1899	41.27
1900	41.7
1901	42.05
1902	42.4
1903	42.76
1904	43.11
1905	43.46
1906	43.81
1907	44.16
1908	44.52
1909	44.87
1910	45.23
1911	45.58
1912	45.93
1913	46.29
1914	45.71
1915	39.51
1916	39.41
1917	39.01
1918	34.5
1919	39.01
1920	43.01
1921	49.1
1922	49.45
1923	49.81
1924	50.16
1925	50.51
1926	51.03
1927	51.55
1928	52.08
1929	52.6
1930	53.12
1931	53.64
1932	54.17
1933	54.69
1934	55.21
1935	55.73
1936	56.26
1937	56.78
1938	57.3
1939	55.01
1940	51.01
1941	12
1942	46.01
1943	44.41
1944	27.01
1945	40.01
1946	52.51
1947	45.51
1948	58.01
1949	60.51
1950	63.57
1951	63.88
1952	64.51
1953	65.13
1954	65.75
1955	66.36
1956	66.97
1957	67.57
1958	68.16
1959	67.7
1960	70.3
1961	70.49
1962	69.42
1963	70.6
1964	71.96
1965	71.71
1966	71.87
1967	71.94
1968	71.63
1969	71.24
1970	71.1
1971	71.81
1972	71.38
1973	71.46
1974	71.1
1975	71.08
1976	71.23
1977	70.87
1978	70.72
1979	70.73
1980	70.72
1981	70.52
1982	70.74
1983	70.84
1984	70.47
1985	70.74
1986	72.27
1987	72.02
1988	72.07
1989	71.5
1990	71.38
1991	70.45
1992	70.29
1993	69.1
1994	68.65
1995	69
1996	70.17
1997	71.06
1998	71.32
1999	71.75
2000	72.02
2001	71.59
2002	71.98
2003	72.01
2004	72.01
2005	71.41
2006	71.16
2007	70.94
2008	71.58
2009	73.01
2010	73.17
2011	73.51
2012	73.89
2013	74.05
2014	74.73
2015	74.86
2016	75.05
2017	75.18
2018	75.31