Year	Years
1800	36.14
1801	35.7
1802	35.26
1803	34.82
1804	34.37
1805	33.93
1806	34.12
1807	34.3
1808	34.49
1809	34.67
1810	34.86
1811	35.49
1812	36.13
1813	36.76
1814	37.39
1815	38.02
1816	39.1
1817	40.17
1818	41.24
1819	42.32
1820	43.39
1821	41.83
1822	40.27
1823	38.71
1824	37.15
1825	35.59
1826	35.55
1827	35.51
1828	35.46
1829	35.42
1830	35.38
1831	36.04
1832	36.71
1833	37.38
1834	38.04
1835	38.71
1836	38.35
1837	37.98
1838	37.62
1839	37.26
1840	36.89
1841	36.55
1842	36.2
1843	35.86
1844	35.51
1845	35.17
1846	34.94
1847	34.71
1848	34.48
1849	34.25
1850	34.02
1851	35.1
1852	36.18
1853	37.26
1854	38.33
1855	39.41
1856	39.33
1857	39.25
1858	39.17
1859	39.08
1860	39
1861	37.39
1862	35.79
1863	34.18
1864	32.57
1865	30.96
1866	33.02
1867	35.08
1868	37.14
1869	39.2
1870	41.25
1871	41.47
1872	41.69
1873	41.91
1874	42.13
1875	42.34
1876	41.88
1877	41.43
1878	40.98
1879	40.53
1880	40.08
1881	40.32
1882	40.56
1883	40.8
1884	41.04
1885	41.27
1886	41.46
1887	41.66
1888	41.86
1889	42.06
1890	42.25
1891	42.4
1892	42.55
1893	42.71
1894	42.85
1895	43
1896	42.98
1897	42.97
1898	43.02
1899	43.07
1900	43.12
1901	43.51
1902	43.89
1903	44.28
1904	44.67
1905	45.05
1906	45.44
1907	45.83
1908	46.22
1909	46.6
1910	46.99
1911	47.38
1912	47.76
1913	48.15
1914	47.45
1915	44.45
1916	44.25
1917	36.96
1918	34.96
1919	37.67
1920	46.3
1921	52.52
1922	51.63
1923	53.24
1924	54.09
1925	54.84
1926	52.42
1927	49.99
1928	52.94
1929	51.53
1930	54.73
1931	53.93
1932	55.68
1933	56.7
1934	57.34
1935	56.18
1936	56.66
1937	57.57
1938	58.86
1939	58.2
1940	56.7
1941	45.92
1942	54.3
1943	53.9
1944	30.94
1945	46.01
1946	53.9
1947	46.91
1948	57.59
1949	58.08
1950	58.51
1951	59.75
1952	60.95
1953	63.52
1954	64.85
1955	65.53
1956	67.15
1957	67.62
1958	68.07
1959	68.48
1960	69.18
1961	69.5
1962	69.68
1963	69.73
1964	70.47
1965	70.54
1966	70.51
1967	70.8
1968	70.41
1969	70.1
1970	70.21
1971	70.3
1972	69.89
1973	70.4
1974	70.38
1975	69.91
1976	69.6
1977	69.57
1978	69.44
1979	69.06
1980	69.29
1981	69
1982	69.52
1983	69.48
1984	69.47
1985	69.53
1986	70.82
1987	70.94
1988	70.9
1989	70.25
1990	70.05
1991	69.57
1992	69.31
1993	68.31
1994	67.05
1995	67.86
1996	69.89
1997	70.13
1998	69.76
1999	70.52
2000	70.79
2001	70.61
2002	71.37
2003	71.88
2004	72.38
2005	72.8
2006	73.11
2007	73.2
2008	74.24
2009	74.97
2010	76
2011	76.28
2012	76.33
2013	77.13
2014	77.07
2015	77.23
2016	77.38
2017	77.52
2018	77.66