Year	constant 2015 US$
1990	382300000
1991	740650000
1992	1018420000
1993	719180000
1994	609130000
1995	717240000
1996	680120000
1997	501980000
1998	739810000
1999	927240000
2000	1188850000
2001	953640000
2002	890260000
2003	591610000
2004	643310000