Year	constant 2015 US$
1990	2652650000
1991	6641660000
1992	3750550000
1993	2768150000
1994	4212370000
1995	5708830000
1996	3275890000
1997	3082170000
1998	4155910000
1999	4917180000
2000	5781680000
2001	5983970000
2002	4149590000
2003	4929940000
2004	5617620000
2005	131840000
2006	201710000
2007	151680000
2008	203580000
2009	145380000
2010	116370000
2011	230000