Year	current US$
2011	9115916303.05725
2012	8058387017.137846
2013	8100569811.975058
2014	6988749854.9577055
2015	6569718274.692327
2016	7641353860.961792
2017	5944649809.421166
2018	5831620614.714884
2019	6785746331.738527