Year	Measure
1800	1073
1801	1073
1802	1073
1803	1073
1804	1073
1805	1073
1806	1073
1807	1073
1808	1073
1809	1073
1810	1073
1811	1073
1812	1073
1813	1073
1814	1073
1815	1073
1816	1073
1817	1073
1818	1073
1819	1073
1820	1073
1821	1074
1822	1075
1823	1077
1824	1078
1825	1079
1826	1080
1827	1081
1828	1082
1829	1084
1830	1085
1831	1086
1832	1087
1833	1088
1834	1090
1835	1091
1836	1092
1837	1093
1838	1094
1839	1096
1840	1097
1841	1098
1842	1099
1843	1100
1844	1102
1845	1103
1846	1104
1847	1105
1848	1107
1849	1108
1850	1109
1851	1110
1852	1111
1853	1113
1854	1114
1855	1115
1856	1116
1857	1118
1858	1119
1859	1120
1860	1121
1861	1122
1862	1124
1863	1125
1864	1126
1865	1127
1866	1129
1867	1130
1868	1131
1869	1132
1870	1134
1871	1144
1872	1154
1873	1165
1874	1176
1875	1186
1876	1197
1877	1208
1878	1219
1879	1230
1880	1241
1881	1253
1882	1264
1883	1276
1884	1287
1885	1299
1886	1311
1887	1323
1888	1335
1889	1347
1890	1359
1891	1372
1892	1384
1893	1397
1894	1409
1895	1422
1896	1435
1897	1448
1898	1462
1899	1475
1900	1488
1901	1502
1902	1516
1903	1529
1904	1543
1905	1557
1906	1572
1907	1586
1908	1600
1909	1615
1910	1630
1911	1645
1912	1660
1913	1675
1914	1629
1915	1585
1916	1542
1917	1500
1918	1530
1919	1560
1920	1591
1921	1623
1922	1655
1923	1661
1924	1666
1925	1672
1926	1678
1927	1683
1928	1689
1929	1695
1930	1664
1931	1634
1932	1604
1933	1575
1934	1546
1935	1518
1936	1490
1937	1510
1938	1531
1939	1552
1940	1574
1941	1595
1942	1617
1943	1639
1944	1662
1945	1685
1946	1708
1947	1731
1948	1755
1949	1779
1950	1804
1951	1695
1952	2086
1953	2309
1954	2586
1955	2276
1956	2627
1957	2716
1958	2276
1959	2293
1960	2264
1961	2227
1962	2955
1963	2598
1964	2917
1965	2831
1966	2523
1967	2600
1968	2618
1969	3032
1970	2601
1971	2763
1972	3339
1973	2951
1974	3541
1975	4093
1976	4394
1977	4198
1978	4417
1979	4428
1980	4793
1981	5071
1982	5000
1983	4898
1984	4540
1985	4661
1986	4290
1987	4238
1988	4657
1989	3750
1990	3809
1991	3991
1992	4399
1993	4498
1994	4693
1995	4894
1996	5246
1997	5385
1998	5620
1999	5291
2000	5188
2001	5232
2002	5474
2003	5341
2004	5546
2005	5738
2006	5888
2007	6094
2008	6246
2009	6497
2010	6603
2011	6358
2012	6432
2013	5464