Year	Measure
1800	963.6
1801	963.6
1802	963.6
1803	963.6
1804	963.6
1805	963.6
1806	963.6
1807	963.6
1808	963.6
1809	963.6
1810	963.6
1811	963.6
1812	963.6
1813	963.6
1814	963.6
1815	963.6
1816	963.6
1817	963.6
1818	963.6
1819	963.6
1820	963.6
1821	967.5
1822	971.4
1823	975.3
1824	979.2
1825	983.1
1826	987.1
1827	991
1828	995
1829	999
1830	1003
1831	1007
1832	1011
1833	1015
1834	1019
1835	1023
1836	1027
1837	1032
1838	1036
1839	1040
1840	1044
1841	1048
1842	1052
1843	1057
1844	1061
1845	1065
1846	1069
1847	1074
1848	1078
1849	1082
1850	1087
1851	1091
1852	1095
1853	1100
1854	1104
1855	1109
1856	1113
1857	1118
1858	1122
1859	1127
1860	1131
1861	1136
1862	1140
1863	1145
1864	1149
1865	1154
1866	1159
1867	1163
1868	1168
1869	1173
1870	1177
1871	1187
1872	1196
1873	1206
1874	1215
1875	1225
1876	1234
1877	1244
1878	1254
1879	1264
1880	1274
1881	1284
1882	1294
1883	1305
1884	1315
1885	1325
1886	1336
1887	1346
1888	1357
1889	1368
1890	1379
1891	1390
1892	1401
1893	1412
1894	1423
1895	1434
1896	1446
1897	1457
1898	1469
1899	1480
1900	1492
1901	1504
1902	1516
1903	1528
1904	1540
1905	1552
1906	1564
1907	1577
1908	1589
1909	1602
1910	1615
1911	1627
1912	1640
1913	1653
1914	1677
1915	1702
1916	1726
1917	1752
1918	1777
1919	1803
1920	1829
1921	1856
1922	1882
1923	1910
1924	1938
1925	1966
1926	1994
1927	2023
1928	2053
1929	2082
1930	2113
1931	2143
1932	2174
1933	2206
1934	2238
1935	2271
1936	2304
1937	2337
1938	2371
1939	2405
1940	2440
1941	2476
1942	2512
1943	2548
1944	2585
1945	2623
1946	2661
1947	2699
1948	2739
1949	2778
1950	2819
1951	2939
1952	3065
1953	3196
1954	3329
1955	3467
1956	3614
1957	3759
1958	3919
1959	4073
1960	4228
1961	4176
1962	4902
1963	4988
1964	4865
1965	4765
1966	4885
1967	7913
1968	13990
1969	17110
1970	17180
1971	16810
1972	17800
1973	14830
1974	16020
1975	19300
1976	20800
1977	19860
1978	18480
1979	18290
1980	18420
1981	20460
1982	21720
1983	24190
1984	27030
1985	29610
1986	29140
1987	30370
1988	30180
1989	30340
1990	29310
1991	29850
1992	31040
1993	31650
1994	31860
1995	32750
1996	33420
1997	35400
1998	36450
1999	36390
2000	38000
2001	39990
2002	39790
2003	38560
2004	38660
2005	39270
2006	40900
2007	43430
2008	48540
2009	47790
2010	47950
2011	46430
2012	47250
2013	48110
2014	48200
2015	48260
2016	48640
2017	49050
2018	49320
2019	49610