Year	current US$
2011	50806259446.249
2012	58519330482.8434
2013	61202161210.0914
2014	62715105556.1618
2015	36552670390.6112
2016	31271222010.7257
2017	37249066645.1403
2018	45764938660.2269
2019	36580643424.5758
2020	25344046191.4622
2021	45068213268.7227