Year	constant 2015 US$
1960	28014420000
1961	34086600000
1962	34547520000
1963	36796040000
1964	36482350000
1965	38696990000
1966	37870810000
1967	39069590000
1968	36002630000
1969	33463700000
1970	35988960000
1971	38190210000
1972	36804100000
1973	43672000000
1974	53691520000
1975	60225910000
1976	55207440000
1977	52082170000
1978	63188390000
1979	62640320000
1980	70519740000
1981	70126910000
1982	65763080000
1983	62162200000
1984	66699760000
1985	69225350000
1986	66428200000
1987	65034350000
1988	65366550000
1989	67994150000
1990	78322540000
1991	80026250000
1992	73673330000
1993	70184050000
1994	72356150000
1995	65026680000
1996	62275830000
1997	61236130000
1998	65376650000
1999	67056000000
2000	67220010000
2001	73402890000
2002	83905180000
2003	85392900000
2004	87886430000
2005	116014400000
2006	110928000000
2007	104104000000
2008	116039200000
2009	119877800000
2010	122524800000
2011	125403500000
2012	120999500000
2013	135602200000
2014	144640400000
2015	152607700000
2016	157965600000
2017	160579500000