Year	current US$
1966	13399999.6185303
1967	15100000.3814697
1968	18220000.762492463
1969	18489999.989047647
1970	19769999.62329867
1971	19660000.38199124
1972	27489999.1620332
1973	50340001.53280794
1974	37650000.58151785
1975	71730003.3569336
1976	77639997.54190451
1977	83219999.9988079
1978	90629997.253418
1979	143899993.89648402
1980	159459996.94801846
1981	146659998.1635806
1982	173210001.83559984
1983	177789992.6733223
1984	172020002.4340299
1985	171770006.73115233
1986	247600004.26508492
1987	294479989.03878045
1988	331180004.82767874
1989	288580007.21968734
1990	259649986.6209928
1991	311419995.0322514
1992	326739990.1691824
1993	333399992.65596247
1994	367909987.9153075
1995	450820001.3041495
1996	404070007.324219
1997	367360006.1237816
1998	370369992.6435945
1999	351460001.25445414
2000	402589997.6193907
2001	388279995.03910595
2002	418379999.99150634
2003	518540001.02728593
2004	579719970.613718