Year	constant 2015 US$
1990	382300000
1991	491000000
1992	684180000
1993	468950000
1994	458820000
1995	472180000
1996	582800000
1997	370840000
1998	639050000
1999	798280000
2000	773330000
2001	728300000
2002	653980000
2003	410340000
2004	429350000