Year	constant 2010 US$
2007	31160756409.6759
2008	33435858238.9035
2009	33974611373.2459
2010	35245990856.977
2011	34951628425.0084
2012	34749898333.8498
2013	35536809744.2669
2014	37225003531.8745
2015	38340485710.1202
2016	38636378621.5488
2017	39413666092.7029
2018	41297584924.0676