Year	constant 2015 US$
1990	396290000
1991	511640000
1992	386360000
1993	261880000
1994	227160000
1995	397770000
1996	313180000
1997	328150000
1998	552840000
1999	595630000
2000	728690000
2001	1143960000
2002	659950000
2003	793500000
2004	1110050000