Year	current US$
1975	24990070000
1976	24425930000
1977	26086000000
1978	43210000000
1979	34658670000
1980	38945300000
1981	38948210000
1982	32266350000
1983	54816680000
1984	53348920000
1985	144396530000
1986	303150980000
1987	649096650000
1988	516157020000
1989	633451170000
1990	872973500000
1991	696106580000
1992	674427710000
1993	885247170000
1994	1119816650000
1995	1133090670000
1996	865282290000
1997	2160101290000
1998	3628581710000
1999	4457552780000
2000	6564772320000
2001	5145017530000
2002	3700430220000
2003	4272721550000
2004	5271761550000
2005	5435120060000
2006	7964229010000
2007	12840470060000
2008	11150292530000
2009	6112265460000
2010	5704586210000
2011	5606552660000
2012	4565800000000
2013	4800643880000
2014	6195104930000
2015	3823082840000