Year	constant 2015 US$
2010	21579495126.44898
2011	21072637623.60735
2012	22153588828.647144
2013	24132623553.663616
2014	25230199093.709152
2015	29136917820.0577
2016	32503530373.553146
2017	32920616467.36379
2018	34033327171.42822
2019	33163082393.422485