Year	constant 2015 US$
1960	5539450000
1961	6780530000
1962	8378790000
1963	9064850000
1964	11010360000
1965	12537740000
1966	11856830000
1967	11644960000
1968	11508570000
1969	10574490000
1970	11222780000
1971	11614150000
1972	12231030000
1973	14782390000
1974	20558180000
1975	23966370000
1976	21801480000
1977	22323770000
1978	23797360000
1979	28250720000
1980	30224550000
1981	29080360000
1982	29785230000
1983	27379980000
1984	29010280000
1985	30677780000
1986	29944340000
1987	29349900000
1988	29533210000
1989	31226440000
1990	33105280000
1991	32327280000
1992	30871370000
1993	29012540000
1994	32259910000
1995	27647810000
1996	24877910000
1997	24160810000
1998	25025800000
1999	23897830000
2000	24454780000
2001	30060370000
2002	34580430000
2003	37052230000
2004	36697700000
2005	43732680000
2006	51824340000
2007	45442470000
2008	46288920000
2009	54336240000
2010	57723380000
2011	56699890000
2012	57161340000
2013	62394580000
2014	59100110000
2015	64964320000
2016	67340500000
2017	75828310000