Year	Measure
1820	469.5
1821	471.7
1822	473.9
1823	476.2
1824	478.4
1825	480.6
1826	482.9
1827	485.1
1828	487.4
1829	489.7
1830	492
1831	494.3
1832	496.6
1833	499
1834	501.3
1835	503.6
1836	506
1837	508.4
1838	510.8
1839	513.2
1840	515.6
1841	518
1842	520.4
1843	522.9
1844	525.3
1845	527.8
1846	530.2
1847	532.7
1848	535.2
1849	537.7
1850	540.3
1851	542.8
1852	545.3
1853	547.9
1854	550.5
1855	553
1856	555.6
1857	558.2
1858	560.9
1859	563.5
1860	566.1
1861	568.8
1862	571.5
1863	574.1
1864	576.8
1865	579.5
1866	582.2
1867	585
1868	587.7
1869	590.5
1870	593.2
1871	596
1872	598.8
1873	601.6
1874	604.5
1875	607.3
1876	610.1
1877	613
1878	615.9
1879	618.8
1880	621.7
1881	624.6
1882	627.5
1883	630.4
1884	633.4
1885	636.4
1886	639.4
1887	642.4
1888	645.4
1889	648.4
1890	651.4
1891	654.5
1892	657.6
1893	660.6
1894	663.7
1895	666.8
1896	670
1897	673.1
1898	676.3
1899	679.4
1900	682.6
1901	685.8
1902	689
1903	692.3
1904	695.5
1905	698.8
1906	702.1
1907	705.4
1908	708.7
1909	712
1910	715.3
1911	718.7
1912	722
1913	725.4
1914	730.2
1915	735.1
1916	739.9
1917	744.8
1918	749.8
1919	754.7
1920	759.7
1921	764.7
1922	769.8
1923	774.9
1924	780
1925	785.2
1926	790.4
1927	795.6
1928	800.9
1929	806.2
1930	811.5
1931	816.9
1932	822.3
1933	827.7
1934	833.2
1935	838.7
1936	844.3
1937	849.9
1938	855.5
1939	861.2
1940	866.9
1941	872.6
1942	878.4
1943	884.2
1944	890
1945	895.9
1946	901.9
1947	907.8
1948	913.8
1949	919.9
1950	926
1951	944.9
1952	963.5
1953	981.7
1954	1000
1955	1019
1956	1038
1957	1057
1958	1075
1959	1094
1960	1142
1961	1165
1962	1262
1963	1358
1964	1333
1965	1403
1966	1356
1967	1333
1968	1315
1969	1249
1970	1259
1971	1301
1972	1207
1973	979.1
1974	1041
1975	988.8
1976	972.4
1977	1023
1978	1133
1979	1184
1980	1211
1981	1195
1982	1150
1983	1101
1984	891.1
1985	883.4
1986	900
1987	845.2
1988	869.3
1989	847.6
1990	810.1
1991	808.1
1992	735
1993	724.7
1994	732.6
1995	730.3
1996	733.9
1997	733.9
1998	788.3
1999	761.8
2000	729.9
2001	759.6
2002	760.1
2003	771.6
2004	743.4
2005	775.2
2006	792
2007	769.2
2008	814.2
2009	779
2010	836.2
2011	828.5
2012	892.4
2013	896.3
2014	926.1
2015	951.5
2016	1054
2017	1145
2018	1219
2019	1281