Year	constant 2015 US$
2006	2963593686.1995635
2007	3144120916.533845
2008	3237647882.6779566
2009	3329156281.207447
2010	2765706774.3795404
2011	1305340390.7883198
2012	1853246926.9836438
2013	1911045246.3489616
2014	2224259654.5510044
2015	2017289188.4651864
2016	1977859834.3929207
2017	1799418457.2604144
2018	1798476459.0402577