Year	current US$
1990	636360005.378723
1991	2821389984.13086
1992	3661589968.68134
1993	4299989908.21838
1994	4315960086.82251
1995	4353849990.84473
1996	3569630058.28857
1997	2922750030.51758
1998	3649199985.50415
1999	4217159896.8505898
2000	3402439994.81201
2001	2510170070.64819
2002	2845320011.1389203
2003	2897259983.06274
2004	3235190059.66187