Year	Measure
1800	855.1
1801	858.4
1802	861.7
1803	865
1804	868.3
1805	871.7
1806	875.1
1807	878.4
1808	881.8
1809	885.2
1810	888.6
1811	892.1
1812	895.5
1813	899
1814	902.4
1815	905.9
1816	909.4
1817	912.9
1818	916.5
1819	920
1820	923.5
1821	927.1
1822	930.7
1823	934.3
1824	937.9
1825	941.5
1826	945.1
1827	948.8
1828	952.5
1829	956.1
1830	959.8
1831	963.5
1832	967.2
1833	971
1834	974.7
1835	978.5
1836	982.3
1837	986.1
1838	989.9
1839	993.7
1840	997.5
1841	1001
1842	1005
1843	1009
1844	1013
1845	1017
1846	1021
1847	1025
1848	1029
1849	1033
1850	1037
1851	1041
1852	1045
1853	1049
1854	1053
1855	1057
1856	1061
1857	1065
1858	1069
1859	1073
1860	1077
1861	1082
1862	1086
1863	1090
1864	1094
1865	1098
1866	1103
1867	1107
1868	1111
1869	1115
1870	1120
1871	1124
1872	1128
1873	1133
1874	1137
1875	1142
1876	1146
1877	1150
1878	1155
1879	1159
1880	1164
1881	1168
1882	1173
1883	1177
1884	1182
1885	1186
1886	1191
1887	1196
1888	1200
1889	1205
1890	1209
1891	1214
1892	1219
1893	1224
1894	1228
1895	1233
1896	1238
1897	1243
1898	1247
1899	1252
1900	1257
1901	1262
1902	1267
1903	1272
1904	1276
1905	1281
1906	1286
1907	1291
1908	1296
1909	1301
1910	1306
1911	1311
1912	1316
1913	1322
1914	1338
1915	1355
1916	1372
1917	1389
1918	1406
1919	1424
1920	1442
1921	1460
1922	1478
1923	1497
1924	1515
1925	1534
1926	1553
1927	1573
1928	1593
1929	1613
1930	1633
1931	1653
1932	1674
1933	1695
1934	1716
1935	1737
1936	1759
1937	1781
1938	1804
1939	1826
1940	1849
1941	1872
1942	1896
1943	1919
1944	1943
1945	1968
1946	1992
1947	2017
1948	2042
1949	2068
1950	2094
1951	2128
1952	2163
1953	2197
1954	2232
1955	2267
1956	2302
1957	2338
1958	2372
1959	2395
1960	2527
1961	2768
1962	2666
1963	2916
1964	3327
1965	3103
1966	3302
1967	3270
1968	3573
1969	3652
1970	3803
1971	3986
1972	3976
1973	4028
1974	4017
1975	4154
1976	4480
1977	4592
1978	4865
1979	4760
1980	4053
1981	4013
1982	3850
1983	3546
1984	3311
1985	3327
1986	3308
1987	3181
1988	3106
1989	3359
1990	3207
1991	3102
1992	2983
1993	2877
1994	2849
1995	2962
1996	3075
1997	3165
1998	3247
1999	3236
2000	3085
2001	3032
2002	2931
2003	2846
2004	2836
2005	2839
2006	2811
2007	2807
2008	2820
2009	2873
2010	2900
2011	2706
2012	2884
2013	3026
2014	3178
2015	3321
2016	3471
2017	3618
2018	3754
2019	3854