Year	Measure
1820	446.4
1821	448.5
1822	450.6
1823	452.7
1824	454.8
1825	457
1826	459.1
1827	461.3
1828	463.4
1829	465.6
1830	467.8
1831	470
1832	472.2
1833	474.4
1834	476.6
1835	478.8
1836	481.1
1837	483.3
1838	485.6
1839	487.9
1840	490.2
1841	492.5
1842	494.8
1843	497.1
1844	499.4
1845	501.8
1846	504.1
1847	506.5
1848	508.9
1849	511.3
1850	513.7
1851	516.1
1852	518.5
1853	520.9
1854	523.4
1855	525.8
1856	528.3
1857	530.8
1858	533.2
1859	535.7
1860	538.3
1861	540.8
1862	543.3
1863	545.9
1864	548.4
1865	551
1866	553.6
1867	556.2
1868	558.8
1869	561.4
1870	564
1871	566.7
1872	569.3
1873	572
1874	574.7
1875	577.4
1876	580.1
1877	582.8
1878	585.5
1879	588.3
1880	591
1881	593.8
1882	596.6
1883	599.4
1884	602.2
1885	605
1886	607.9
1887	610.7
1888	613.6
1889	616.5
1890	619.4
1891	622.3
1892	625.2
1893	628.1
1894	631.1
1895	634
1896	637
1897	640
1898	643
1899	646
1900	649
1901	652.1
1902	655.1
1903	658.2
1904	661.3
1905	664.4
1906	667.5
1907	670.6
1908	673.8
1909	676.9
1910	680.1
1911	683.3
1912	686.5
1913	689.7
1914	701.9
1915	714.3
1916	726.9
1917	739.8
1918	752.9
1919	766.2
1920	779.7
1921	793.5
1922	807.5
1923	821.8
1924	836.3
1925	851.1
1926	866.1
1927	881.5
1928	897
1929	912.9
1930	929
1931	945.4
1932	962.2
1933	979.2
1934	996.5
1935	1014
1936	1032
1937	1050
1938	1069
1939	1088
1940	1107
1941	1126
1942	1146
1943	1167
1944	1187
1945	1208
1946	1230
1947	1251
1948	1273
1949	1296
1950	1319
1951	1351
1952	1383
1953	1414
1954	1445
1955	1476
1956	1507
1957	1537
1958	1567
1959	1597
1960	1582
1961	1612
1962	1540
1963	1506
1964	1500
1965	1480
1966	1441
1967	1466
1968	1449
1969	1491
1970	1522
1971	1443
1972	1381
1973	1415
1974	1346
1975	1336
1976	1359
1977	1432
1978	1420
1979	1305
1980	1259
1981	1245
1982	1235
1983	1130
1984	1173
1985	1151
1986	1145
1987	1091
1988	1081
1989	1090
1990	1099
1991	1061
1992	965.4
1993	939.4
1994	973.1
1995	1002
1996	907.2
1997	955.8
1998	971.2
1999	985.6
2000	983.8
2001	972.6
2002	953.5
2003	867.1
2004	866.2
2005	871.3
2006	894.9
2007	917.8
2008	918.3
2009	900.9
2010	905.7
2011	912.8
2012	932
2013	584.6
2014	581.7
2015	600.8
2016	622.8
2017	645.6
2018	669.9
2019	694.5