Year	constant 2015 US$
1991	21980000
1992	148920000
1993	70710000
1994	70470000
1995	80950000
1996	83070000
1997	102950000
1998	142820000
1999	133900000
2000	114070000
2001	125380000
2002	95920000
2003	117210000
2004	167240000