Year	constant 2015 US$
2008	18386513033.628025
2009	19215112318.110287
2010	20430650583.696533
2011	17061944188.294718
2012	22656493636.989906
2013	24265037605.58143
2014	40042646225.31646
2015	43312710567.4984
2016	45672820486.65533
2017	46928154972.14666
2018	49156289723.86091
2019	51654200917.99179
2020	53930141193.04425
2021	55752536034.05083