Year	Measure
1800	1038
1801	1039
1802	1041
1803	1043
1804	1045
1805	1047
1806	1048
1807	1050
1808	1052
1809	1054
1810	1055
1811	1057
1812	1059
1813	1061
1814	1063
1815	1064
1816	1066
1817	1068
1818	1070
1819	1072
1820	1073
1821	1079
1822	1084
1823	1090
1824	1096
1825	1101
1826	1107
1827	1113
1828	1118
1829	1124
1830	1130
1831	1136
1832	1142
1833	1147
1834	1153
1835	1159
1836	1165
1837	1171
1838	1177
1839	1183
1840	1189
1841	1195
1842	1202
1843	1208
1844	1214
1845	1220
1846	1227
1847	1233
1848	1239
1849	1246
1850	1252
1851	1258
1852	1265
1853	1271
1854	1278
1855	1285
1856	1291
1857	1298
1858	1305
1859	1311
1860	1318
1861	1316
1862	1232
1863	1316
1864	1331
1865	1308
1866	1317
1867	1217
1868	1379
1869	1514
1870	1566
1871	1549
1872	1574
1873	1640
1874	1655
1875	1665
1876	1731
1877	1665
1878	1612
1879	1604
1880	1587
1881	1526
1882	1653
1883	1690
1884	1676
1885	1692
1886	1753
1887	1753
1888	1790
1889	1823
1890	1898
1891	1856
1892	1759
1893	1843
1894	1923
1895	2051
1896	2158
1897	2232
1898	2293
1899	2209
1900	2293
1901	2249
1902	2187
1903	2317
1904	2379
1905	2394
1906	2466
1907	2521
1908	2514
1909	2590
1910	2620
1911	2665
1912	2780
1913	2901
1914	2750
1915	2586
1916	2602
1917	2173
1918	1883
1919	2279
1920	2536
1921	2590
1922	2828
1923	3005
1924	3057
1925	3200
1926	3287
1927	3514
1928	3721
1929	3734
1930	3664
1931	3547
1932	3504
1933	3713
1934	4107
1935	4250
1936	4506
1937	4729
1938	4933
1939	4683
1940	4426
1941	4566
1942	4573
1943	5081
1944	5064
1945	4741
1946	5062
1947	5108
1948	5439
1949	5694
1950	5846
1951	6283
1952	6425
1953	6393
1954	6874
1955	7142
1956	7278
1957	7545
1958	7524
1959	7908
1960	8563
1961	9151
1962	9372
1963	9612
1964	10040
1965	10540
1966	10750
1967	10920
1968	11120
1969	12200
1970	13160
1971	13420
1972	14360
1973	15240
1974	15610
1975	15720
1976	15610
1977	15610
1978	15890
1979	16950
1980	17800
1981	18050
1982	18530
1983	18920
1984	19390
1985	19960
1986	20370
1987	21140
1988	22110
1989	23290
1990	23180
1991	21580
1992	20650
1993	20290
1994	21010
1995	21650
1996	22400
1997	23720
1998	25000
1999	25920
2000	27170
2001	27830
2002	28200
2003	28650
2004	29650
2005	30470
2006	31680
2007	33230
2008	33160
2009	30190
2010	31050
2011	31760
2012	31550
2013	31570
2014	31790
2015	32110
2016	32620
2017	33160
2018	33700