Year	Measure
1800	1050
1801	1054
1802	1058
1803	1061
1804	1065
1805	1069
1806	1073
1807	1077
1808	1081
1809	1084
1810	1088
1811	1092
1812	1096
1813	1100
1814	1104
1815	1108
1816	1112
1817	1116
1818	1120
1819	1124
1820	1128
1821	1132
1822	1136
1823	1140
1824	1144
1825	1149
1826	1153
1827	1157
1828	1161
1829	1165
1830	1169
1831	1174
1832	1178
1833	1182
1834	1186
1835	1191
1836	1195
1837	1199
1838	1203
1839	1208
1840	1212
1841	1217
1842	1221
1843	1225
1844	1230
1845	1234
1846	1239
1847	1243
1848	1247
1849	1252
1850	1256
1851	1261
1852	1266
1853	1270
1854	1275
1855	1279
1856	1284
1857	1288
1858	1293
1859	1298
1860	1302
1861	1307
1862	1312
1863	1316
1864	1321
1865	1326
1866	1331
1867	1336
1868	1340
1869	1345
1870	1350
1871	1369
1872	1389
1873	1409
1874	1430
1875	1450
1876	1471
1877	1492
1878	1514
1879	1536
1880	1558
1881	1580
1882	1603
1883	1626
1884	1650
1885	1674
1886	1698
1887	1722
1888	1747
1889	1772
1890	1798
1891	1824
1892	1850
1893	1877
1894	1904
1895	1932
1896	1959
1897	1988
1898	2016
1899	2046
1900	2075
1901	2105
1902	2135
1903	2166
1904	2198
1905	2229
1906	2261
1907	2294
1908	2327
1909	2361
1910	2395
1911	2429
1912	2464
1913	2500
1914	2379
1915	2263
1916	2154
1917	2049
1918	1950
1919	2054
1920	2163
1921	2279
1922	2400
1923	2383
1924	2367
1925	2350
1926	2299
1927	2249
1928	2200
1929	2040
1930	1892
1931	1755
1932	1628
1933	1510
1934	1400
1935	1379
1936	1357
1937	1337
1938	1316
1939	1296
1940	1276
1941	1257
1942	1238
1943	1219
1944	1200
1945	1208
1946	1216
1947	1225
1948	1233
1949	1242
1950	1250
1951	1257
1952	1264
1953	1271
1954	1278
1955	1286
1956	1293
1957	1300
1958	1457
1959	1633
1960	1831
1961	2052
1962	2300
1963	3000
1964	5097
1965	8660
1966	14710
1967	25000
1968	30040
1969	36100
1970	43390
1971	42000
1972	40300
1973	61700
1974	151000
1975	169700
1976	167000
1977	169200
1978	144600
1979	160900
1980	184600
1981	183100
1982	159700
1983	146300
1984	141200
1985	130600
1986	101100
1987	102200
1988	83380
1989	92870
1990	115700
1991	110500
1992	108300
1993	104000
1994	105700
1995	107300
1996	107800
1997	110400
1998	104900
1999	102800
2000	108900
2001	106700
2002	106200
2003	110500
2004	111500
2005	103100
2006	96400
2007	83660
2008	73610
2009	61730
2010	57380
2011	56380
2012	57120
2013	58100
2014	58860
2015	59540
2016	60150
2017	60790
2018	61490
2019	62150