Year	Measure
1820	602.9
1821	605.7
1822	608.6
1823	611.4
1824	614.3
1825	617.2
1826	620.1
1827	623
1828	625.9
1829	628.8
1830	631.8
1831	634.7
1832	637.7
1833	640.7
1834	643.7
1835	646.7
1836	649.8
1837	652.8
1838	655.9
1839	658.9
1840	662
1841	665.1
1842	668.3
1843	671.4
1844	674.5
1845	677.7
1846	680.9
1847	684.1
1848	687.3
1849	690.5
1850	693.7
1851	697
1852	700.3
1853	703.5
1854	706.8
1855	710.2
1856	713.5
1857	716.8
1858	720.2
1859	723.6
1860	727
1861	730.4
1862	733.8
1863	737.2
1864	740.7
1865	744.2
1866	747.7
1867	751.2
1868	754.7
1869	758.2
1870	761.8
1871	765.4
1872	768.9
1873	772.5
1874	776.2
1875	779.8
1876	783.5
1877	787.1
1878	790.8
1879	794.5
1880	798.3
1881	802
1882	805.8
1883	809.5
1884	813.3
1885	817.2
1886	821
1887	824.8
1888	828.7
1889	832.6
1890	836.5
1891	840.4
1892	844.4
1893	848.3
1894	852.3
1895	856.3
1896	860.3
1897	864.3
1898	868.4
1899	872.5
1900	876.6
1901	880.7
1902	884.8
1903	888.9
1904	893.1
1905	897.3
1906	901.5
1907	905.7
1908	910
1909	914.2
1910	918.5
1911	922.8
1912	927.2
1913	931.5
1914	949.9
1915	968.7
1916	987.8
1917	1007
1918	1027
1919	1048
1920	1068
1921	1089
1922	1111
1923	1133
1924	1155
1925	1178
1926	1201
1927	1225
1928	1249
1929	1274
1930	1299
1931	1325
1932	1351
1933	1378
1934	1405
1935	1433
1936	1461
1937	1490
1938	1519
1939	1549
1940	1580
1941	1611
1942	1643
1943	1676
1944	1709
1945	1742
1946	1777
1947	1812
1948	1848
1949	1884
1950	1922
1951	1963
1952	2004
1953	2044
1954	2085
1955	2126
1956	2166
1957	2207
1958	2248
1959	2287
1960	2274
1961	2276
1962	2282
1963	2215
1964	2256
1965	2198
1966	2197
1967	2269
1968	2372
1969	2408
1970	2478
1971	2517
1972	2428
1973	2311
1974	2302
1975	2276
1976	2149
1977	2144
1978	2035
1979	2175
1980	2132
1981	1895
1982	1809
1983	1773
1984	1661
1985	1651
1986	1616
1987	1605
1988	1584
1989	1601
1990	1615
1991	1470
1992	1445
1993	1433
1994	1391
1995	1374
1996	1361
1997	1370
1998	1381
1999	1403
2000	1426
2001	1467
2002	1242
2003	1324
2004	1352
2005	1372
2006	1402
2007	1450
2008	1512
2009	1412
2010	1382
2011	1372
2012	1371
2013	1369
2014	1377
2015	1398
2016	1427
2017	1465
2018	1505
2019	1547