Year	constant 2015 US$
2007	18636132423.900642
2008	18738373794.680103
2009	16507498844.817656
2010	16311075320.511326
2011	16967173508.699097
2012	16676207873.497908
2013	16697791046.372908
2014	16710604945.73521
2015	16498071570.478642
2016	16504476167.856413
2017	16839066852.830385
2018	17071838331.469582
2019	17313248607.802776