Year	current US$
1970	40361584.9137203
1971	46567424.1048755
1972	57008696.3701406
1973	61000179.4981331
1974	71698690.5504475
1975	91861580.4451893
1976	89798747.8713278
1977	94220173.2788438
1978	95163315.8019206
1979	117797777.297726
1980	133010126.486297
1981	109399428.695595
1982	100769173.65332
1983	5312863.20145976
1984	5257719.12707276
1985	5578214.38010451
1986	7744394.91093798
1987	9816281.02301696
1988	10412950.5645814
1989	7540283.68810234
1990	10506447.1429386
1991	11531926.6503501
1992	15147785.7370318
1993	15208531.9517055
1994	16375119.1495711
1995	19552977.0278253
1996	19437261.6620538
1997	17735267.9084829
1998	17020011.4993455
1999	16468156.8346503
2000	14481392.1356097