Year	constant 2021 US$
1990	425090003.967285
1991	1695850006.10352
1992	3389909976.95923
1993	4276499942.77954
1994	3148699958.80127
1995	3046839874.26758
1996	2398019954.6814003
1997	1806309997.5585902
1998	2258720050.81177
1999	3511429931.64063
2000	3095180015.56396
2001	2389890010.8337398
2002	2557639940.26184
2003	2417340037.34589
2004	2591169945.7168603