Year	current US$
1975	15872316.76767761
1976	18630002.724550683
1977	48760004.28510108
1978	102925012.20060307
1979	94771796.13815062
1980	213871949.65219843
1981	165118953.66626832
2007	721794104.0814211
2008	773869539.6903536
2009	523400468.79094875
2010	451206688.1949058
2011	346888742.4049673
2012	440772085.1521547
2013	528091920.83991826
2014	616963471.321861
2015	578104517.1097597
2016	369315879.31673485
2017	170949797.9285964
2018	424945932.5945476
2019	435396197.9590081
2020	424019996.9819522
2021	406788716.3223227
2022	314632438.5915962