Year	constant 2015 US$
2010	52671.93974803096
2011	49491.46789077975
2012	46362.19467621194
2013	44562.105712687895
2014	44413.42521249835
2015	42143.48695077355
2016	41219.97709951919
2017	40584.09725519374
2018	39724.143084182935
2019	39777.91906594845
2020	41596.095781065706
2021	43568.21028167404
2022	43733.83704826422