Year	constant 2015 US$
1960	213640000
1961	326960000
1962	198690000
1963	239990000
1964	289970000
1965	423200000
1966	426960000
1967	445120000
1968	357260000
1969	374250000
1970	369320000
1971	363230000
1972	315460000
1973	324600000
1974	235730000
1975	136080000
1976	94710000
1977	89350000
1978	179880000
1979	120980000
1980	93960000
1981	93270000
1982	103010000
1983	83260000
1984	85690000
1985	92510000
1986	89730000
1987	91970000
1988	112030000
1989	216950000
1990	204970000
1991	184270000
1992	206810000
1993	257090000
1994	255420000
1995	322690000
1996	380050000
1997	404650000
1998	348230000
1999	343600000
2000	346380000
2001	334430000
2002	364400000
2003	349740000
2004	288860000
2005	315900000
2006	380370000
2007	390700000
2008	455680000
2009	393180000
2010	375840000
2011	340150000
2012	353710000
2013	377550000
2014	430740000
2015	481120000
2016	399460000
2017	467310000