Year	constant 2021 US$
1990	457790008.544922
1991	581340026.855469
1992	791020019.53125
1993	496730010.986328
1994	443679992.675781
1995	455779998.779297
1996	609059997.558594
1997	432320007.324219
1998	739969970.703125
1999	915869995.117188
2000	893369995.117188
2001	837500000
2002	749119995.117188
2003	471829986.57226604
2004	492820007.324219