Year	current US$
2002	8360933793.9436
2003	8882838552.648176
2004	10594696320.250454
2005	12474680730.631481
2006	13497091619.005594
2007	16337984451.175783
2008	18620758981.25297
2009	17094746948.19741
2010	19353816531.44258
2011	22075754397.68267
2012	24845752197.72561
2013	30431940546.14491
2014	32161859984.461018
2015	28769927668.461468
2016	28752324644.9277
2017	33067492527.972637
2018	37140379379.564125
2019	39815755763.431625