Year	constant 2015 US$
2006	33490.56055897059
2007	34043.67217289867
2008	34138.401973561464
2009	32902.39818285283
2010	34175.33144732162
2011	35139.436461381796
2012	37118.81400627588
2013	36986.206458816305
2014	37695.1157786865
2015	37561.15785933385
2016	37601.911451072985
2017	38207.5284133117
2018	38309.7760615353
2019	37510.1568376704
2020	35974.89271484972
2021	37639.01479004546
2022	38795.171267649544