Year	current US$
2008	5550009209.99999
2009	5826615299.61656
2010	16198507551.9144
2011	22169312278.2723
2012	21960923523.1305
2013	20312610587.0831
2014	21325133340.5136
2015	18962821420.8085
2016	18989873835.3909
2017	19176779765.0717