Year	Measure
1800	534
1820	540.1
1885	789.2
1886	758.4
1887	886.4
1888	852.3
1889	792.1
1890	788.5
1891	721.9
1892	789.9
1893	894.7
1894	1017
1895	940.4
1896	1035
1897	1017
1898	1044
1899	1107
1900	1083
1901	1110
1902	1205
1903	1121
1904	1240
1905	1097
1906	1048
1907	1006
1908	1098
1909	1140
1910	1216
1911	1123
1912	1212
1913	1273
1914	1215
1915	1250
1916	1111
1917	974.7
1918	596.4
1919	513.9
1920	515.8
1921	471.9
1922	547.5
1923	630.3
1924	798.1
1925	996.9
1926	1119
1927	1165
1928	1224
1929	1238
1930	1293
1931	1304
1932	1284
1933	1331
1934	1453
1935	1660
1936	1772
1937	1919
1938	1912
1939	1989
1940	1905
1946	1696
1947	1883
1948	2126
1949	2321
1950	2513
1951	2481
1952	2595
1953	2661
1954	2742
1955	2923
1956	3145
1957	3152
1958	3328
1959	3231
1960	3473
1961	3607
1962	3644
1963	3508
1964	3907
1965	4079
1966	4111
1967	4444
1968	4597
1969	4652
1970	5471
1971	5846
1972	6095
1973	6395
1974	6651
1975	7050
1976	7351
1977	7489
1978	7636
1979	8001
1980	8278
1981	8578
1982	8728
1983	9127
1984	9597
1985	9502
1986	9893
1987	10060
1988	10510
1989	11040
1990	10220
1991	8960
1992	6152
1993	5949
1994	6170
1995	6192
1996	6488
1997	7143
1998	7605
1999	8029
2000	8649
2001	9396
2002	10090
2003	10880
2004	11890
2005	13220
2006	14840
2007	16400
2008	15990
2009	13330
2010	13470
2011	14520
2012	15580
2013	16270
2014	17010
2015	17770
2016	18550
2017	19350
2018	20180