Year	constant 2015 US$
2010	37279045199.24366
2011	39205556159.694565
2012	44680277806.02508
2013	44642408444.3049
2014	48192475471.44531
2015	51487109941.10061
2016	53651603851.185165
2017	58595040628.67674
2018	59495755229.28957
2019	53296993662.964424