Year	constant 2015 US$
2010	12751.68015401202
2011	12276.707129140625
2012	12316.105608844939
2013	12030.548950838343
2014	12236.12170948566
2015	12180.247156735588
2016	11895.539267554941
2017	12087.20134634399
2018	12014.791804138156
2019	11945.981023189086