Year	constant 2015 US$
1990	2652650000
1991	6641660000
1992	3750540000
1993	2758320000
1994	4025590000
1995	5584350000
1996	3030740000
1997	2898710000
1998	4045390000
1999	4806700000
2000	5592650000
2001	5623090000
2002	3892500000
2003	4780350000
2004	5480270000
2011	230000