Year	constant 2015 US$
1990	3279550000
1991	6622210000
1992	6453380000
1993	6308690000
1994	6305260000
1995	8371060000
1996	4736670000
1997	3771550000
1998	4726300000
1999	6497240000
2000	6891540000
2001	5865230000
2002	5191630000
2003	5144150000
2004	5888230000
2011	230000