Year	current US$
2012	42995227.84248247
2013	41768999.51693162
2014	34386981.06066839
2015	33462939.904819377
2016	40400521.71517916
2017	27954495.435514823
2018	30785877.05394833
2019	23164357.42138887
2020	24907692.307692308
2021	26787151.080027234