Year	Measure
1800	672
1820	686.2
1885	1034
1886	994.3
1887	1163
1888	1118
1889	1040
1890	1036
1891	948.7
1892	1039
1893	1177
1894	1338
1895	1238
1896	1364
1897	1341
1898	1377
1899	1461
1900	1429
1901	1465
1902	1592
1903	1482
1904	1639
1905	1451
1906	1387
1907	1332
1908	1455
1909	1511
1910	1612
1911	1489
1912	1609
1913	1690
1914	1614
1915	1661
1916	1477
1917	1297
1918	794
1919	684.5
1920	687.3
1921	629.1
1922	730.2
1923	841.1
1924	1066
1925	1332
1926	1495
1927	1557
1928	1638
1929	1657
1930	1732
1931	1747
1932	1720
1933	1785
1934	1949
1935	2228
1936	2380
1937	2577
1938	2570
1939	2674
1940	2563
1946	2287
1947	2542
1948	2871
1949	3136
1950	3397
1951	3355
1952	3511
1953	3602
1954	3714
1955	3961
1956	4264
1957	4275
1958	4516
1959	4387
1960	4717
1961	4899
1962	4950
1963	4765
1964	5307
1965	5540
1966	5743
1967	5934
1968	6219
1969	6247
1970	6665
1971	6776
1972	6746
1973	7244
1974	7318
1975	7205
1976	7407
1977	7447
1978	7500
1979	7336
1980	7220
1981	7162
1982	7213
1983	7314
1984	7273
1985	7208
1986	7372
1987	7338
1988	7368
1989	7375
1990	7085
1991	6265
1992	5920
1993	5405
1994	4802
1995	4493
1996	4568
1997	4709
1998	4692
1999	4870
2000	5366
2001	6082
2002	6667
2003	7273
2004	7930
2005	8699
2006	9538
2007	10270
2008	10480
2009	10460
2010	11040
2011	11640
2012	11980
2013	12520
2014	13090
2015	13770
2016	14460
2017	15210
2018	15990