Year	current US$
2005	8778026395.397966
2006	13285232619.567284
2007	17181345682.51834
2008	22412205362.76426
2009	16710036457.559088
2010	18945075037.045006
2011	20508100993.7069
2012	18008875817.240585
2013	17181554535.13645
2014	17449644443.50324
2015	17201626481.22403
2016	12538371668.97783
2017	18279664842.88322
2018	22081348896.046047
2019	26043279440.74595