Year	current US$
1970	25419999.599456802
1971	22020000.934600793
1972	22340000.15258786
1973	35569999.69482425
1974	42780000.6866455
1975	64800001.144409195
1976	86459999.0844726
1977	126180002.2125244
1978	87139999.3896485
1979	81709999.0844726
1980	68610000.6103516
1981	93180000.30517581
1982	55959999.0844727
1983	62599998.47412111
1984	28229999.5422363
1985	55190000.5340577
1986	41809999.465942346
1987	39889999.747276284
1988	41379999.16076665
1989	35530001.640319824
1990	50580000.400543235
1991	199009994.50683576
1992	372689999.5803833
1993	260150003.9100647
1994	364780000.6866455
1995	481670002.9373174
1996	496819993.9727784
1997	482340003.9672854
1998	569990007.4005134
1999	743119989.395141
2000	501679998.3978276
2001	644909987.6880653
2002	512519995.6893915
2003	810130004.8828136
2004	909679990.2915962