Year	current US$
1971	5218551.43119107
1972	5423360.7784045
1973	7453719.07896514
1974	65343693.9703601
1975	244220761.251424
1976	278604997.026022
1977	302674509.905347
1978	267311311.92246
1979	265501176.337446
1980	445209540.338708
1981	824691347.770592
1982	930345604.394264
1983	488480945.015294
1984	345497687.289331
1985	430346389.611125
1986	208123854.063564
1987	21201073.9529825
1988	111153616.032881
1989	181718041.468953
1990	199917169.641735
1991	165031837.372913
1992	74530066.7859427
1993	7619723.18053507
1994	7367666.62480502
1995	63017617.5710207
1996	15353975.9854277
1997	7516249.35386514
1998	17077705.0968326
1999	9026315.90020563
2000	27154456.4687115
2001	160322280.785541
2002	42780256.3019989
2003	40758248.4132589
2004	557176170.236466
2005	408728543.38036
2006	447750890.575702
2007	651805588.290071
2008	1733122778.59302
2009	413284193.162018
2010	819294721.888399
2011	1251818593.13841
2012	743498187.532417
2013	584837673.232487
2014	476394270.257822
2015	279328756.790837
2016	355907333.149657
2017	331070469.070712
2018	325479759.205853
2019	266387793.196454
2020	211754883.904709
2021	430717722.357014