Year	current US$
1966	13439999.5803833
1967	15140000.3433228
1968	18219999.3133545
1969	18489999.7711182
1970	19770000.4577637
1971	19670000.0762939
1972	27489999.7711182
1973	50349998.4741211
1974	37659999.8474121
1975	71739997.8637695
1976	77650001.5258789
1977	83230003.3569336
1978	90650001.5258789
1979	143919998.168945
1980	159460006.71386698
1981	146679992.67578098
1982	173220001.220703
1983	177800003.05175802
1984	172039993.28613302
1985	171990005.493164
1986	247600006.10351598
1987	294480010.986328
1988	331179992.675781
1989	288619995.11718804
1990	259660003.662109
1991	311470001.220703
1992	326790008.544922
1993	333489990.234375
1994	367910003.66210896
1995	450929992.675781
1996	404070007.324219
1997	367390014.64843804
1998	370369995.11718804
1999	351500000