Year	constant 2021 US$
1991	21520000.4577637
1992	149899993.89648402
1993	69330001.8310547
1994	68139999.3896484
1995	78889999.3896484
1996	81209999.0844727
1997	100870002.746582
1998	140429992.67578098
1999	132250000
2000	113000000
2001	123080001.831055
2002	92790000.9155273
2003	116010002.13623
2004	165960006.71386698