Year	Measure
1800	1262
1801	1263
1802	1265
1803	1267
1804	1269
1805	1271
1806	1273
1807	1274
1808	1276
1809	1278
1810	1280
1811	1282
1812	1284
1813	1286
1814	1287
1815	1289
1816	1291
1817	1293
1818	1295
1819	1297
1820	1299
1821	1306
1822	1314
1823	1322
1824	1330
1825	1338
1826	1346
1827	1354
1828	1363
1829	1371
1830	1379
1831	1271
1832	1290
1833	1434
1834	1500
1835	1470
1836	1431
1837	1434
1838	1440
1839	1442
1840	1574
1841	1605
1842	1615
1843	1580
1844	1611
1845	1683
1846	1714
1847	1649
1848	1560
1849	1601
1850	1641
1851	1744
1852	1728
1853	1809
1854	1860
1855	1955
1856	1918
1857	1813
1858	1881
1859	1921
1860	1989
1861	1935
1862	2104
1863	2110
1864	2190
1865	2284
1866	2307
1867	2356
1868	2347
1869	2435
1870	2425
1871	2458
1872	2609
1873	2657
1874	2738
1875	2793
1876	2836
1877	2828
1878	2697
1879	2691
1880	2758
1881	2783
1882	2788
1883	2784
1884	2824
1885	2834
1886	2834
1887	2858
1888	2987
1889	3097
1890	3167
1891	3178
1892	3224
1893	3296
1894	3292
1895	3297
1896	3350
1897	3485
1898	3469
1899	3534
1900	3543
1901	3598
1902	3628
1903	3592
1904	3591
1905	3607
1906	3747
1907	3900
1908	4003
1909	4062
1910	4207
1911	4348
1912	4529
1913	4736
1914	4794
1915	4962
1916	5115
1917	4605
1918	4382
1919	5094
1920	5372
1921	4800
1922	5273
1923	5389
1924	5366
1925	5669
1926	5732
1927	5934
1928	6185
1929	6759
1930	7251
1931	6656
1932	6956
1933	7104
1934	7328
1935	7668
1936	8159
1937	8495
1938	8651
1939	9030
1940	8228
1941	8395
1942	8033
1943	7828
1944	7365
1945	8186
1946	8935
1947	10040
1948	10640
1949	10830
1950	11280
1951	11800
1952	12120
1953	12500
1954	13030
1955	13210
1956	13810
1957	14120
1958	14030
1959	14520
1960	15250
1961	16110
1962	16460
1963	16990
1964	17740
1965	18570
1966	19150
1967	20210
1968	20530
1969	21310
1970	21630
1971	22630
1972	23650
1973	24570
1974	25490
1975	26730
1976	28210
1977	29350
1978	30320
1979	31630
1980	33150
1981	33420
1982	33430
1983	34580
1984	36590
1985	38450
1986	39770
1987	40480
1988	40320
1989	40610
1990	41380
1991	42760
1992	44000
1993	45020
1994	47210
1995	49100
1996	51520
1997	54000
1998	54920
1999	55790
2000	57340
2001	58280
2002	59000
2003	59450
2004	61600
2005	63150
2006	64040
2007	65040
2008	64170
2009	62570
2010	61880
2011	61900
2012	62800
2013	62560
2014	63050
2015	63520
2016	64060
2017	64660
2018	65290
2019	65930