Year	Measure
1800	1644
1801	1644
1802	1644
1803	1644
1804	1644
1805	1644
1806	1644
1807	1644
1808	1644
1809	1644
1810	1644
1811	1644
1812	1644
1813	1644
1814	1644
1815	1644
1816	1644
1817	1644
1818	1644
1819	1644
1820	1644
1821	1630
1822	1617
1823	1603
1824	1590
1825	1576
1826	1563
1827	1550
1828	1537
1829	1524
1830	1511
1831	1498
1832	1486
1833	1473
1834	1461
1835	1449
1836	1436
1837	1424
1838	1412
1839	1400
1840	1389
1841	1377
1842	1365
1843	1354
1844	1342
1845	1331
1846	1320
1847	1309
1848	1298
1849	1287
1850	1276
1851	1275
1852	1274
1853	1273
1854	1272
1855	1271
1856	1270
1857	1269
1858	1268
1859	1267
1860	1266
1861	1265
1862	1264
1863	1263
1864	1262
1865	1261
1866	1260
1867	1259
1868	1258
1869	1257
1870	1256
1871	1259
1872	1263
1873	1267
1874	1271
1875	1274
1876	1278
1877	1282
1878	1286
1879	1290
1880	1293
1881	1297
1882	1301
1883	1305
1884	1309
1885	1313
1886	1317
1887	1321
1888	1325
1889	1329
1890	1333
1891	1336
1892	1340
1893	1344
1894	1348
1895	1352
1896	1357
1897	1361
1898	1365
1899	1369
1900	1373
1901	1377
1902	1381
1903	1385
1904	1389
1905	1393
1906	1397
1907	1402
1908	1406
1909	1410
1910	1414
1911	1418
1912	1423
1913	1427
1914	1454
1915	1482
1916	1510
1917	1538
1918	1567
1919	1597
1920	1627
1921	1658
1922	1690
1923	1722
1924	1754
1925	1788
1926	1821
1927	1856
1928	1891
1929	1927
1930	1964
1931	2001
1932	2039
1933	2077
1934	2117
1935	2157
1936	2198
1937	2239
1938	2282
1939	2281
1940	2280
1941	2278
1942	2277
1943	2698
1944	3043
1945	3432
1946	3870
1947	3549
1948	3397
1949	3252
1950	3113
1951	3314
1952	3529
1953	3968
1954	4360
1955	4741
1956	5139
1957	5792
1958	5768
1959	5963
1960	6226
1961	6341
1962	6388
1963	6469
1964	6814
1965	7203
1966	7342
1967	7457
1968	7705
1969	8166
1970	9031
1971	8924
1972	9052
1973	9692
1974	9171
1975	9022
1976	8362
1977	8097
1978	8070
1979	7827
1980	7324
1981	7420
1982	7389
1983	7533
1984	7448
1985	7087
1986	7190
1987	7733
1988	7944
1989	8460
1990	8884
1991	8871
1992	9016
1993	9068
1994	9129
1995	9162
1996	8908
1997	8672
1998	8538
1999	8437
2000	8443
2001	8508
2002	8517
2003	8635
2004	8637
2005	8684
2006	8883
2007	8967
2008	8857
2009	8549
2010	8392
2011	8485
2012	8400
2013	8398
2014	8462
2015	8561
2016	8696
2017	8861
2018	9049
2019	9245