Year	constant 2015 US$
1990	2652650000
1991	6641660000
1992	3750540000
1993	2758320000
1994	4025590000
1995	5584350000
1996	3030740000
1997	2953780000
1998	4092100000
1999	4880540000
2000	5676220000
2001	5697330000
2002	3943440000
2003	4808870000
2004	5554610000
2011	230000