Year	current US$
2008	5013558863.88928
2009	7008170549.17563
2010	11352561373.7049
2011	17470861489.0572
2012	17286929980.51
2013	18729102567.1527
2014	20481272559.7829
2015	20512264259.6675
2016	20174584717.2259
2017	20985553458.606