Year	current US$
1970	0
1971	0
1972	15494.4310488496
1973	57534.5904203631
1974	159907.839255941
1975	485191.994920139
1976	742854.689104526
1977	5179590.07861787
1978	3711892.06753828
1979	8934410.48391371
1980	5409840.88992164
1981	32869148.5722536
1982	81736090.2848714
1983	152656224.858907
1984	148734716.605455
1985	224656671.341987
1986	142414394.870254
1987	269395557.891029
1988	200508461.316286
1989	360686190.370784
1990	557975894.286712
1991	341866437.202022
1992	380161923.19322
1993	425584943.16632
1994	425897093.277064
1995	506584664.782521
1996	793320486.297388
1997	753368482.227189
1998	211596128.182411
1999	840214737.949824
2000	2105751447.46009
2001	1651924204.86049
2002	1752946037.20371
2003	1997520748.70965
2004	2775363663.74517
2005	3843600039.64246
2006	4356461326.26914
2007	4328681153.57558
2008	6550046379.52324
2009	3205581709.95318
2010	3306269682.49523
2011	4754809737.71794
2012	4204417590.23736
2013	3351551980.35868
2014	2879528347.06326
2015	1336015203.90608
2016	895974798.58905
2017	1319000853.50627
2018	1719910453.70673
2019	1231994637.02166
2020	397339078.814595
2021	942615482.045216