Year	current US$
2010	4564465622.8727
2011	7385159972.77059
2012	7888359428.18244
2013	8019605173.58747
2014	8116269571.13683
2015	8639074200.13615
2016	8941320626.27638
2017	9209802586.79374
2018	7145813478.55684