Year	constant 2015 US$
2010	37532734291.392204
2011	38595818790.27052
2012	41809028014.438385
2013	43869613299.11314
2014	46027199644.45391
2015	47609455812.16013
2016	48154154075.90015
2017	49858545182.339714
2018	51870078954.94819
2019	53053296322.08505