Year	Measure
1800	923
1801	925.5
1802	928
1803	930.5
1804	933
1805	935.5
1806	938
1807	940.5
1808	943
1809	945.5
1810	948.1
1811	950.6
1812	953.2
1813	955.7
1814	958.3
1815	960.9
1816	963.5
1817	966.1
1818	968.6
1819	971.2
1820	973.9
1821	976.5
1822	979.1
1823	981.7
1824	984.4
1825	987
1826	989.7
1827	992.3
1828	995
1829	997.6
1830	1000
1831	1003
1832	1006
1833	1008
1834	1011
1835	1014
1836	1017
1837	1019
1838	1022
1839	1025
1840	1028
1841	1030
1842	1033
1843	1036
1844	1039
1845	1041
1846	1044
1847	1047
1848	1050
1849	1053
1850	1055
1851	1058
1852	1061
1853	1064
1854	1067
1855	1070
1856	1073
1857	1075
1858	1078
1859	1081
1860	1084
1861	1087
1862	1090
1863	1093
1864	1096
1865	1099
1866	1102
1867	1105
1868	1108
1869	1111
1870	1114
1871	1117
1872	1120
1873	1123
1874	1126
1875	1129
1876	1132
1877	1135
1878	1138
1879	1141
1880	1144
1881	1147
1882	1150
1883	1153
1884	1156
1885	1159
1886	1162
1887	1166
1888	1169
1889	1172
1890	1175
1891	1178
1892	1181
1893	1184
1894	1188
1895	1191
1896	1194
1897	1197
1898	1200
1899	1204
1900	1207
1901	1210
1902	1213
1903	1217
1904	1220
1905	1223
1906	1226
1907	1230
1908	1233
1909	1236
1910	1240
1911	1243
1912	1246
1913	1250
1914	1253
1915	1256
1916	1260
1917	1263
1918	1267
1919	1270
1920	1273
1921	1277
1922	1280
1923	1284
1924	1287
1925	1291
1926	1294
1927	1298
1928	1301
1929	1304
1930	1308
1931	1312
1932	1315
1933	1319
1934	1322
1935	1326
1936	1329
1937	1333
1938	1336
1939	1340
1940	1344
1941	1347
1942	1351
1943	1354
1944	1358
1945	1362
1946	1365
1947	1369
1948	1373
1949	1376
1950	1380
1951	1390
1952	1399
1953	1409
1954	1417
1955	1426
1956	1433
1957	1440
1958	1446
1959	1453
1960	1460
1961	1468
1962	1477
1963	1490
1964	1498
1965	1509
1966	1526
1967	1543
1968	1557
1969	1576
1970	1863
1971	2141
1972	2263
1973	2484
1974	2569
1975	2701
1976	3033
1977	3274
1978	3455
1979	3547
1980	3469
1981	3579
1982	3538
1983	3636
1984	3669
1985	3532
1986	3499
1987	3528
1988	3560
1989	3563
1990	3441
1991	3482
1992	3578
1993	3536
1994	3598
1995	3644
1996	3676
1997	3746
1998	3857
1999	3892
2000	4017
2001	4053
2002	4094
2003	4129
2004	4177
2005	4295
2006	4320
2007	4354
2008	4420
2009	4494
2010	4534
2011	3761
2012	3739
2013	3789
2014	3866
2015	3919
2016	3953
2017	3991
2018	4042
2019	4119