Year	constant 2015 US$
1990	390300000
1991	872770000
1992	2716770000
1993	3542530000
1994	2584850000
1995	2462050000
1996	1911970000
1997	1339140000
1998	1756460000
1999	2759650000
2000	2336290000
2001	1612460000
2002	1812380000
2003	1660840000
2004	1643200000