Year	constant 2015 US$
1991	4352.5257995649345
1992	4258.41640527508
1993	4062.856815749256
1994	3981.0701185966354
1995	3969.657553100115
1996	3968.369318818689
1997	4024.7519831861773
1998	4056.4206725314993
1999	4120.84709913311
2000	4116.6470891602485
2001	4120.795902881936
2002	4034.9321971727413
2003	3987.04266550675
2004	4024.512844789415
2005	3988.2072401266873
2006	4017.1197209983425
2007	4183.5571335450495
2008	4187.160977936313
2009	4041.1706023705387
2010	4131.703841804225
2011	4148.036827302801
2012	4201.685468370388
2013	4331.507706138998
2014	4450.453428197853
2015	4553.805645047792
2016	4609.298622027401
2017	4645.005556295835
2018	4386.908731042951
2019	4134.5963900000415
2020	4051.6351029990187
2021	4169.5435366742695
2022	4144.929055394434