Year	constant 2015 US$
1960	22188690000
1961	27373760000
1962	28705680000
1963	30976590000
1964	32445810000
1965	34505780000
1966	35076850000
1967	35566830000
1968	33940140000
1969	30602740000
1970	31766390000
1971	32421120000
1972	30670080000
1973	35521410000
1974	45263180000
1975	52724070000
1976	49059520000
1977	46525310000
1978	48439730000
1979	51514710000
1980	57151760000
1981	57386430000
1982	55719360000
1983	52120580000
1984	54115060000
1985	57098610000
1986	53783140000
1987	51972850000
1988	51751580000
1989	54445330000
1990	69526590000
1991	73387920000
1992	65484290000
1993	61026300000
1994	64434860000
1995	59218790000
1996	52758770000
1997	49668030000
1998	53843330000
1999	55854080000
2000	54910630000
2001	61162770000
2002	65599380000
2003	67863710000
2004	68804630000
2005	91894550000
2006	84456570000
2007	75879410000
2008	79889010000
2009	82323570000
2010	82553190000
2011	84102950000
2012	83395510000
2013	91686850000
2014	89725740000
2015	95085940000
2016	98780230000
2017	104603520000