Year	Measure
1800	497
1820	497
1870	530.1
1890	683.5
1913	732.9
1929	691.9
1938	720.6
1950	712.4
1951	740.1
1952	757.8
1953	815.5
1954	783.4
1955	824
1956	810.6
1957	793.6
1958	796.7
1959	865
1960	940.1
1961	959
1962	1002
1963	1051
1964	1089
1965	1140
1966	1231
1967	1295
1968	1361
1969	1427
1970	1477
1971	1504
1972	1524
1973	1634
1974	1665
1975	1708
1976	1823
1977	1961
1978	2111
1979	2176
1980	2227
1981	2314
1982	2393
1983	2483
1984	2582
1985	2659
1986	2764
1987	2983
1988	3330
1989	3684
1990	4040
1991	4328
1992	4617
1993	4940
1994	5317
1995	5735
1996	6001
1997	5853
1998	5184
1999	5366
2000	5578
2001	5656
2002	5913
2003	6273
2004	6620
2005	6869
2006	7172
2007	7508
2008	7652
2009	7458
2010	7996
2011	7978
2012	8451
2013	8908
2014	9244
2015	9576
2016	9968
2017	10400
2018	10850