Year	constant 2015 US$
1990	2088180000
1991	3979290000
1992	2110120000
1993	1608060000
1994	2650510000
1995	4646660000
1996	1591060000
1997	1331190000
1998	1368040000
1999	1895780000
2000	2504160000
2001	1744640000
2002	1494010000
2003	1651080000
2004	1882740000