Year	constant 2015 US$
1992	3067.240382162911
1993	1310.554351073118
1994	1110.7292642387606
1995	1003.3651664251697
1996	1052.2114800218053
1997	1170.547786799942
1998	1305.7437110321619
1999	1351.516726520831
2000	1483.0479963497664
2001	1642.9406919820653
2002	1777.9552656670842
2003	1966.4920406666697
2004	2234.3826853835894
2005	2585.348576548931
2006	2975.5731829047313
2007	3303.295317568802
2008	3856.312406557378
2009	3704.109621468957
2010	4008.372745864748
2011	4736.998376909377
2012	4921.683152117731
2013	4910.24053969082
2014	5062.448645618536
2015	4824.419478171563
2016	4547.301572303516
2017	4738.289530032927
2018	4949.365011880597
2019	5101.1594964335345
2020	5038.743441650208
2021	5240.941888265082