Year	current US$
1975	4763010000
1976	5872000000
1977	7866000000
1978	9963000000
1979	4678350000
1980	4747900000
1981	4020580000
1982	4921430000
1983	9482660000
1984	11095310000
1985	20206640000
1986	33607600000
1987	44544020000
1988	30165540000
1989	48881340000
1990	43698110000
1991	42545370000
1992	44532750000
1993	51112190000
1994	75939950000
1995	115795800000
1996	171321000000
1997	248329300000
1998	404865990000
1999	419908790000
2000	650382120000
2001	455908330000
2002	528096140000
2003	538915870000
2004	628501280000
2005	594702360000
2006	900783940000
2007	1541464470000
2008	970763610000
2009	542076600000
2010	557392430000
2011	517450890000
2012	417462270000
2013	476592480000
2014	476177030000