Year	current US$
1990	2120320027.3513842
1991	4262730010.986333
1992	4616470004.081733
1993	4315549951.553345
1994	4431780033.111574
1995	6724739913.940435
1996	3489450019.836426
1997	2530489974.9755864
1998	3172220005.0354033
1999	4382299957.275387
2000	4264320014.953621
2001	3596210094.4519043
2002	3421580005.6457515
2003	3821599964.141848
2004	4795360103.607186
2011	280000.001192093