Year	Measure
1800	950
1801	951.4
1802	952.8
1803	954.1
1804	955.5
1805	956.9
1806	958.3
1807	959.7
1808	961.1
1809	962.4
1810	963.8
1811	965.2
1812	966.6
1813	968
1814	969.4
1815	970.8
1816	972.2
1817	973.6
1818	975.1
1819	976.5
1820	977.9
1821	983.8
1822	989.7
1823	995.7
1824	1002
1825	1008
1826	1014
1827	1020
1828	1026
1829	1032
1830	1038
1831	956.8
1832	971.4
1833	1080
1834	1130
1835	1107
1836	1077
1837	1080
1838	1085
1839	1086
1840	1185
1841	1208
1842	1216
1843	1190
1844	1213
1845	1267
1846	1291
1847	1242
1848	1175
1849	1206
1850	1236
1851	1313
1852	1301
1853	1362
1854	1401
1855	1472
1856	1444
1857	1365
1858	1416
1859	1446
1860	1498
1861	1457
1862	1584
1863	1589
1864	1649
1865	1720
1866	1737
1867	1774
1868	1767
1869	1834
1870	1826
1871	1851
1872	1964
1873	2001
1874	2062
1875	2103
1876	2136
1877	2129
1878	2031
1879	2026
1880	2077
1881	2096
1882	2099
1883	2096
1884	2127
1885	2134
1886	2134
1887	2152
1888	2249
1889	2332
1890	2385
1891	2393
1892	2428
1893	2482
1894	2479
1895	2482
1896	2523
1897	2624
1898	2612
1899	2661
1900	2668
1901	2709
1902	2732
1903	2705
1904	2704
1905	2716
1906	2822
1907	2937
1908	3014
1909	3058
1910	3168
1911	3274
1912	3410
1913	3566
1914	3610
1915	3737
1916	3852
1917	3468
1918	3300
1919	3836
1920	4045
1921	3615
1922	3970
1923	4058
1924	4041
1925	4269
1926	4316
1927	4469
1928	4658
1929	5089
1930	5460
1931	5012
1932	5238
1933	5350
1934	5518
1935	5774
1936	6144
1937	6396
1938	6514
1939	6800
1940	6195
1941	6322
1942	6049
1943	5895
1944	5546
1945	6164
1946	6728
1947	7563
1948	8013
1949	8158
1950	8490
1951	8884
1952	9126
1953	9413
1954	9809
1955	9948
1956	10400
1957	10640
1958	10560
1959	10940
1960	11480
1961	12130
1962	12390
1963	12790
1964	13360
1965	13980
1966	14420
1967	15220
1968	15460
1969	16050
1970	16290
1971	17040
1972	17810
1973	18500
1974	19190
1975	20120
1976	21250
1977	22100
1978	22830
1979	23820
1980	24960
1981	25160
1982	25170
1983	26040
1984	27550
1985	28950
1986	29950
1987	30480
1988	30360
1989	30580
1990	31160
1991	32200
1992	33140
1993	33900
1994	35550
1995	36980
1996	38790
1997	40660
1998	41360
1999	42010
2000	43170
2001	43890
2002	44430
2003	44770
2004	46390
2005	47550
2006	48220
2007	48980
2008	48320
2009	47120
2010	46600
2011	46610
2012	47380
2013	48020
2014	48540
2015	49000
2016	49480
2017	49960
2018	50470