Year	constant 2015 US$
1989	4470.918046259272
1990	4614.484991284457
1991	4799.405046703485
1992	4917.785321955166
1993	4979.395175672795
1994	5216.502939757958
1995	5173.622571665691
1996	5318.35800052119
1997	5534.0307300499835
1998	5534.92951063271
1999	5372.398632487216
2000	5452.253756863973
2001	5383.524534189176
2002	5329.893246211313
2003	5316.546182863367
2004	5470.932066106842
2005	5541.546271354208
2006	5891.810985751944
2007	6196.0895862490825
2008	6306.478972282218
2009	6105.07534414799
2010	6446.922458824889
2011	6638.974586616815
2012	6642.911780836244
2013	6799.898199562401
2014	6807.201825920497
2015	6799.4921206073395
2016	6680.523998591514
2017	6843.512170988269
2018	6800.167504231291
2019	6812.966018640515
2020	6304.260131576319
2021	6514.645491847426