Year	current US$
1974	432400713.502047
1975	670390648.68532
1976	798128937.988881
1977	967272804.825303
1978	579699147.71211
1979	1279527654.35729
1980	1932261723.61195
1981	2600169119.31584
1982	2001300437.92279
1983	2066474241.98267
1984	2335835845.449
1985	2103265669.58349
1986	591706462.869475
1987	1491747473.83989
1988	807779335.738755
1989	1528699209.54323
1990	1498768587.16529
1991	333656176.853052
1992	256169121.039164
1993	-328096749.024707
1994	-81352360.4294968
1995	-107847442.513297
1996	846745047.05662
1997	933952209.018844
1998	-76055299.6733699
1999	1095497647.75198
2000	4325718236.329
2001	3426693652.36089
2002	4072235353.70813
2003	4291818428.79248
2004	4969914070.92102
2005	8790919904.27022
2006	11929214455.0596
2007	11755394126.8193
2008	21723932177.1891
2009	5868551915.26776
2010	16882619748.3792
2011	19836278208.0719
2012	23050602671.5811
2013	22542708159.357
2014	17667157577.5007
2015	5193724892.82232
2016	2579867281.01791
2017	4909184274.0925
2018	18595001517.7587
2019	13129725066.5679
2020	3281937313.12202
2021	9497556863.49255