Year	constant 2015 US$
2007	5128178437.170866
2008	5276856988.364783
2009	4339938715.019168
2010	4016273918.7870994
2011	3955394563.0046277
2012	3830094150.827967
2013	4012251246.4873714
2014	4050889305.4242477
2015	4245566239.871573
2016	4360489323.506907
2017	4584345207.026895
2018	4961587334.323451
2019	5141703944.033719