Year	Measure
1820	628
1821	631
1822	633.9
1823	636.9
1824	639.9
1825	642.9
1826	645.9
1827	648.9
1828	652
1829	655
1830	658.1
1831	661.2
1832	664.3
1833	667.4
1834	670.5
1835	673.7
1836	676.8
1837	680
1838	683.2
1839	686.4
1840	689.6
1841	692.9
1842	696.1
1843	699.4
1844	702.7
1845	706
1846	709.3
1847	712.6
1848	715.9
1849	719.3
1850	722.7
1851	726
1852	729.5
1853	732.9
1854	736.3
1855	739.8
1856	743.2
1857	746.7
1858	750.2
1859	753.7
1860	757.3
1861	760.8
1862	764.4
1863	768
1864	771.6
1865	775.2
1866	778.8
1867	782.5
1868	786.1
1869	789.8
1870	793.5
1871	797.3
1872	801
1873	804.8
1874	808.5
1875	812.3
1876	816.1
1877	820
1878	823.8
1879	827.7
1880	831.5
1881	835.4
1882	839.4
1883	843.3
1884	847.2
1885	851.2
1886	855.2
1887	859.2
1888	863.3
1889	867.3
1890	871.4
1891	875.5
1892	879.6
1893	883.7
1894	887.8
1895	892
1896	896.2
1897	900.4
1898	904.6
1899	908.8
1900	913.1
1901	917.4
1902	921.7
1903	926
1904	930.3
1905	934.7
1906	939.1
1907	943.5
1908	947.9
1909	952.4
1910	956.8
1911	961.3
1912	965.8
1913	970.4
1914	977.1
1915	983.8
1916	990.7
1917	997.5
1918	1004
1919	1011
1920	1018
1921	1025
1922	1033
1923	1040
1924	1047
1925	1054
1926	1061
1927	1069
1928	1076
1929	1084
1930	1091
1931	1099
1932	1106
1933	1114
1934	1122
1935	1129
1936	1137
1937	1145
1938	1153
1939	1161
1940	1169
1941	1177
1942	1185
1943	1194
1944	1202
1945	1210
1946	1219
1947	1227
1948	1236
1949	1244
1950	1253
1951	1229
1952	1205
1953	1149
1954	1158
1955	1135
1956	1112
1957	1088
1958	1105
1959	1122
1960	1131
1961	1141
1962	1077
1963	1101
1964	1148
1965	1179
1966	1193
1967	1175
1968	1190
1969	1194
1970	1188
1971	1162
1972	1232
1973	1227
1974	1104
1975	1121
1976	1137
1977	1167
1978	1171
1979	1229
1980	1309
1981	1346
1982	1449
1983	1346
1984	1411
1985	1471
1986	1458
1987	1390
1988	1387
1989	1314
1990	1322
1991	1340
1992	1351
1993	1336
1994	1325
1995	1335
1996	1363
1997	1398
1998	1420
1999	1444
2000	1483
2001	1512
2002	1557
2003	1572
2004	1576
2005	1577
2006	1586
2007	1610
2008	1642
2009	1637
2010	1632
2011	1643
2012	1685
2013	1734
2014	1782
2015	1828
2016	1870
2017	1913
2018	1960
2019	2009