Year	current US$
1975	25153070000
1976	24616930000
1977	26509000000
1978	43696000000
1979	36783860000
1980	40796260000
1981	42674640000
1982	36936370000
1983	64832110000
1984	61978540000
1985	156701810000
1986	322130850000
1987	670830600000
1988	539819010000
1989	665483750000
1990	900532740000
1991	726760770000
1992	718499700000
1993	948098230000
1994	1240833810000
1995	1264138970000
1996	1041443960000
1997	2370204890000
1998	3909379980000
1999	4742720030000
2000	7060912780000
2001	5524721710000
2002	3934618340000
2003	4540767420000
2004	5701123290000
2005	5520068780000
2006	8080700760000
2007	13025285230000
2008	11264365830000
2009	6224873390000
2010	5824623940000
2011	5719128760000
2012	4656894510000
2013	4898712310000
2014	6272341000000