Year	current US$
1989	10900000
1990	2088000000
1991	223500000
1992	814700000
1993	1439600000
1994	940500000
1995	621200000
1996	949800000
1997	1222800000
1998	1911300000
1999	2345000000
2000	129800000.00000001
2001	63500000
2002	6900000
2004	3400000
2006	337000000
2007	728700000
2008	331000000
2009	5890000
2011	234500000
2012	16000000