Year	current US$
2011	6842552839.590433
2012	8340403474.088627
2013	9105138183.962208
2014	10387269588.30338
2015	10769404748.603222
2016	10938141306.836124
2017	14080338520.826828
2018	13955918415.249918
2019	14490715547.376871