Year	Measure
1800	606.9
1820	606.9
1950	741.1
1951	761.6
1952	786.6
1953	809.5
1954	834.5
1955	859.1
1956	884.6
1957	912.7
1958	939.2
1959	967.8
1960	996.7
1961	1026
1962	1056
1963	1089
1964	1122
1965	1155
1966	1189
1967	1226
1968	1263
1969	1300
1970	1340
1971	1381
1972	1422
1973	1464
1974	1508
1975	1553
1976	1598
1977	1648
1978	1697
1979	1748
1980	1800
1981	1897
1982	2001
1983	2059
1984	2122
1985	2182
1986	2322
1987	2338
1988	2391
1989	2389
1990	2269
1991	2012
1992	1785
1993	1706
1994	1724
1995	1814
1996	1841
1997	1902
1998	1958
1999	2009
2000	2018
2001	2062
2002	2141
2003	2270
2004	2487
2005	2643
2006	2835
2007	3082
2008	3300
2009	3198
2010	3346
2011	3887
2012	4300
2013	4831
2014	5312
2015	5631
2016	6074
2017	6438
2018	6908