Year	current US$
1990	338000000
1991	1588000000
1992	318000000
1993	82000000
1994	901000000
1995	39000000
1996	119000000
1997	43000000
1998	58890000.12353059
1999	134410000.38385397
2000	234060000.77724418
2001	125840002.95400609
2002	155969996.21391302
2003	140480000.61511996
2004	133290002.58445737
2005	22889999.3896484
2006	30940000.5340576
2007	21139999.3896484
2008	7389999.8664856
2009	3700000.04768372
2010	-29999.999329447703