Year	constant 2015 US$
1960	2534480000
1961	2686390000
1962	3316850000
1963	3169390000
1964	3414400000
1965	4485030000
1966	4477650000
1967	3822050000
1968	3875670000
1969	3721310000
1970	3904480000
1971	4113290000
1972	4935070000
1973	6347900000
1974	9858020000
1975	10626970000
1976	10164400000
1977	11777610000
1978	11912600000
1979	14318090000
1980	14840920000
1981	15223550000
1982	13994330000
1983	13179620000
1984	12947360000
1985	13766200000
1986	12460720000
1987	12701270000
1988	11162750000
1989	10695790000
1990	13068510000
1991	11695220000
1992	10661670000
1993	10541760000
1994	13365970000
1995	10314620000
1996	9439890000
1997	8625640000
1998	9297030000
1999	8038440000
2000	8242700000
2001	9663870000
2002	14570950000
2003	20119510000
2004	19040770000
2005	41295630000
2006	27410010000
2007	29072850000
2008	32217770000
2009	30455340000
2010	31687480000
2011	31644190000
2012	30209890000
2013	33520600000
2014	30645190000
2015	33519180000
2016	38558430000
2017	43585030000