Year	constant 2015 US$
2006	3683.9371454229276
2007	3749.1066836370696
2008	3698.4858340612154
2009	3778.3611399694055
2010	3873.5298372872116
2011	3890.448394573776
2012	3890.204167356987
2013	3852.958301789241
2014	3916.780665392375
2015	4004.9699373144003
2016	4070.677300014662
2017	4164.0512835612935
2018	4292.809946813751
2019	4459.128176159593
2020	4347.202644872478
2021	4591.335512609772
2022	4703.899180977678