Year	current US$
1990	2287570031.16608
1991	6644069961.54785
1992	6048170001.02997
1993	5990109964.37073
1994	6873610111.23657
1995	8741209880.82886
1996	5616080043.79272
1997	4656280014.03809
1998	6085589992.52319
1999	7036439914.70337
2000	6517620005.644859
2001	5425840056.41937
2002	5001270011.59824
2003	6026829976.10979
2004	7170750109.37452