Year	constant 2015 US$
2009	541.6153917208494
2010	538.2009605750374
2011	511.1845056198302
2012	501.5443066146957
2013	286.8898071773452
2014	277.185989967576
2015	293.402626903364
2016	330.0047464673923
2017	311.30284745442725
2018	377.4617913111648
2019	372.39335963881507
2020	357.0092689912606
2021	347.3378649206266