Year	current US$
1966	17200000.762939498
1967	11600000.3814697
1968	15800000.1907349
1969	16399999.618530298
1970	21299999.237060502
1971	36500000
1972	54299999.237060495
1973	74639999.3896484
1974	62069999.6948242
1975	64709999.0844727
1976	46400001.5258789
1977	76500000
1978	114169998.168945
1979	148050003.05175802
1980	197649993.89648402
1981	147509994.506836
1982	158169998.168945
1983	181740005.493164
1984	129539993.286133
1985	145100006.10351598
1986	205309997.55859402
1987	281579986.57226604
1988	260809997.558594
1989	280450012.207031
1990	299040008.544922
1991	307500000
1992	353269989.013672
1993	391420013.42773396
1994	402070007.324219
1995	440989990.234375
1996	390609985.35156304
1997	335380004.88281304
1998	335019989.013672
1999	313869995.11718804
2000	348540008.544922
2001	294799987.792969
2002	322940002.441406
2003	453450012.207031
2004	509660003.66210896