Year	current US$
1970	8987699.20720803
1971	8669165.0388849
1972	9274610.09589092
1973	9646335.95295672
1974	9943279.60698295
1975	12666937.4864427
1976	15537626.2465807
1977	14365827.3350103
1978	6071083.82952636
1979	12697253.200672
1980	15988960.5169797
1981	11038217.0187628
1982	2382565.86140001
1983	2359822.19735102
1984	3134079.71940005
1985	4786124.84294221
1986	497766.754708339
1987	1121888.87839503
1988	73849651.9258178
1989	74037577.0561559
1990	25338496.3601156
1991	29103466.3348543
1992	21632407.8843366
1993	9391858.8642175
1994	3441438.9712265
1995	11037843.9673135
1996	32965011.167282
1997	19397992.5245049
1998	5805178.7822744
1999	12804466.3396713
2000	71273320.7120547
2001	29451701.8429801
2002	43281266.1721339
2003	94386017.7603323
2004	171743099.694936
2005	158091084.126134
2006	329867780.909259
2007	1145293344.4443
2008	176629473.107434
2009	107626516.150894
2010	219277396.476084
2011	198442938.168635
2012	73504756.6718945
2013	10650612.5505196
2014	37937223.994997
2015	24822514.6710365
2016	5239799.92086294
2017	18821909.3488669
2018	84472165.8850684
2019	73520434.5486221
2020	74228701.2553312
2021	404267568.250577