Year	constant 2015 US$
1960	996980000
1961	4105720000
1962	4431340000
1963	5306270000
1964	4029460000
1965	4610730000
1966	5760780000
1967	5178880000
1968	6625220000
1969	4839950000
1970	4914640000
1971	4118110000
1972	4051180000
1973	3825070000
1974	3784350000
1975	4107370000
1976	3689330000
1977	3309320000
1978	3573750000
1979	3823210000
1980	4057560000
1981	4964880000
1982	5230710000
1983	5495430000
1984	6097190000
1985	6538750000
1986	6091390000
1987	6129070000
1988	5908370000
1989	6453930000
1990	6481090000
1991	7014760000
1992	5991520000
1993	6205920000
1994	6376540000
1995	6351100000
1996	6218880000
1997	5588970000
1998	5615980000
1999	5905930000
2000	4918160000
2001	7157520000
2002	5927360000
2003	6360990000
2004	6114700000
2005	6006020000
2006	6592900000
2007	5523140000
2008	6562580000
2009	6943510000
2010	8297020000
2011	8214200000
2012	7075860000
2013	6718250000
2014	6717100000
2015	7410110000
2016	6981380000
2017	6131430000