Year	constant 2015 US$
1990	8360.775709705338
1991	7136.761609567707
1992	6654.904127223131
1993	6755.5989457269025
1994	7146.602682984468
1995	7542.111028313916
1996	8024.3875309039695
1997	8484.220777360704
1998	8818.210826339271
1999	8799.88587594508
2000	8914.598984152888
2001	9221.521860824003
2002	9640.865301325017
2003	10177.72141895484
2004	10717.173171120714
2005	11425.900147269596
2006	12395.75218096627
2007	13734.455549532051
2008	14487.706531776625
2009	13679.08440809154
2010	14584.260678210063
2011	14954.577975505019
2012	15126.03529877615
2013	15205.395578054617
2014	15600.367167180191
2015	16390.882174850707
2016	16687.98445714916
2017	17151.652477668038
2018	17818.234107216696
2019	18240.993719768336
2020	17618.50133970466
2021	18498.36026675449
2022	18898.042844063802
2023	19217.473984898515