Year	current US$
1985	31900000
1988	3192000000
1990	700000
1992	160000000
1993	814000000
1994	2010600000
1995	1889000000
1996	2981000000
1997	2210300000
1998	591900000
1999	187880000
2000	1079700000
2001	684300000
2003	1569900000
2004	342110000
2005	586950000
2006	531000000
2007	423000000
2008	425000000
2013	381000000
2017	1543000000