Year	constant 2015 US$
2002	18204.605812805166
2003	16820.97166952527
2004	17565.00076054181
2005	18318.862460484466
2006	17759.488535683944
2007	17870.874843458652
2008	18413.00039737403
2009	18586.530689282834
2010	18398.940294826647
2011	18574.786931036655
2012	19186.03603664619
2013	19235.180506241148
2014	19256.302617727833
2015	19568.03867173082
2016	19821.011149938586
2017	20321.970988773657
2018	20177.520404150473
2019	20201.69764276821
2020	19446.69141849782
2021	19899.52852874958
2022	19999.348389638315