Year	current US$
1990	636359985.351563
1991	2821389892.57813
1992	3661590087.89063
1993	4299989746.09375
1994	4315959960.9375
1995	4353850097.65625
1996	3569629882.8125
1997	2922510009.76563
1998	3648959960.9375
1999	4216919921.875
2000	3438859863.28125
2001	2541600097.65625
2002	2869810058.59375
2003	2932150146.48438
2004	3259860107.42188