Year	current US$
2005	5846620234.833928
2006	10733243870.000086
2007	15285519001.705336
2008	20847180001.43232
2009	15385554161.194248
2010	18265849657.17167
2011	20879159783.84308
2012	20716055735.30865
2013	23527665646.266216
2014	25905035223.8558
2015	27735614934.888622
2016	21759323962.9429
2017	27052614478.07312
2018	32880665576.225277
2019	40772702771.66606