Year	Measure
1800	514.1
1820	518.7
1850	539.9
1870	554.8
1871	547.3
1872	540.3
1873	545.4
1874	552
1875	556.5
1876	567.8
1877	568.9
1878	556.4
1879	562.8
1880	561
1881	589.1
1882	567.3
1883	554.7
1884	595
1885	594.5
1886	585
1887	585.6
1888	580.5
1889	575
1890	554.2
1891	563.9
1892	580.1
1893	591.6
1894	593.5
1895	588.5
1896	586
1897	586.2
1898	582
1899	604.2
1900	615.9
1901	600.8
1902	583.1
1903	608.3
1904	609.5
1905	610.2
1906	619.6
1907	627.9
1908	621.2
1909	643.4
1910	673.9
1911	697.4
1912	700.8
1913	723.9
1914	715.9
1915	717.2
1916	715.3
1917	709.2
1918	722.5
1919	779.1
1920	748.5
1921	741.6
1922	753
1923	758.9
1924	788
1925	793.8
1926	829.9
1927	870.9
1928	891.6
1929	903.9
1930	904.3
1931	823.3
1932	808.2
1933	801.5
1934	804.9
1935	830.8
1936	881.1
1937	936.2
1938	949.7
1939	949.5
1940	1018
1941	1013
1942	743.6
1943	659.2
1944	525.2
1945	462.6
1946	477.2
1947	527
1948	611.5
1949	666.1
1950	704.4
1951	744.3
1952	749.7
1953	770.9
1954	807.6
1955	823.7
1956	804.8
1957	858.9
1958	792.5
1959	816.6
1960	835
1961	859.8
1962	849.3
1963	798.2
1964	809.6
1965	802.6
1966	794.1
1967	762.4
1968	827.3
1969	911.1
1970	986.7
1971	1023
1972	1111
1973	1245
1974	1262
1975	1229
1976	1315
1977	1383
1978	1418
1979	1456
1980	1549
1981	1608
1982	1517
1983	1533
1984	1609
1985	1620
1986	1690
1987	1748
1988	1822
1989	1956
1990	2098
1991	2177
1992	2383
1993	2519
1994	2674
1995	2852
1996	3027
1997	3119
1998	2656
1999	2627
2000	2715
2001	2788
2002	2874
2003	2984
2004	3096
2005	3234
2006	3364
2007	3527
2008	3687
2009	3803
2010	3983
2011	4182
2012	4380
2013	4590
2014	4815
2015	5053
2016	5306
2017	5572
2018	5850