Year	current US$
1970	113019179.262419
1971	148125820.494425
1972	193815083.512038
1973	292191363.336436
1974	1058619916.39545
1975	1028981744.06129
1976	1671704695.0967
1977	1923904945.03012
1978	2217600523.00271
1979	4033186811.90787
1980	4328113997.60122
1981	4514392562.89728
1982	4055921973.60714
1983	5060335092.61941
1984	5273862941.20316
1985	6264111430.69198
1986	4488819200.99379
1987	5333812515.42198
1988	5469861231.41961
1989	5847476985.00778
1990	6955900599.83261
1991	6875912474.09877
1992	6515421097.6502
1993	7456557675.30042
1994	7883789771.482
1995	7858832987.82379
1996	7458543996.02136
1997	6967894457.94393
1998	10640934799.2306
1999	11773966142.7419
2000	13682998165.5796
2001	13359900278.3147
2002	13718939209.5652
2003	15561584913.8945
2004	18717308337.7324
2005	23798813526.0988
2006	27360332408.9803
2007	30351660723.507
2008	38012170169.021
2009	31456633235.5533
2010	38464153598.6825
2011	48932394167.3697
2012	53678188668.8235
2013	54630003610.1637
2014	55540333674.9225
2015	48258830948.6664
2016	47476427675.9356
2017	50251863760.4083
2018	59234989604.6832
2019	58317035697.2074
2020	51539005238.603