Year	constant 2015 US$
1997	1315.4164831311405
1998	1396.1665023745434
1999	1614.8628021408656
2000	1807.6356151948462
2001	2007.5064000388725
2002	2080.6637773359707
2003	2196.53602816351
2004	2338.0236149892116
2005	2439.412780171471
2006	2628.9318879438033
2007	2740.679114962087
2008	2936.791101353555
2009	2980.306929395879
2010	3156.962940185525
2011	3182.0872007207604
2012	3155.0072409807317
2013	3225.3287180962275
2014	3255.219321951218
2015	3277.788243422314
2016	3398.652438809445
2017	3466.9997849032743
2018	3606.074266211594
2019	3648.657466979133
2020	3534.1442533664017
2021	4010.906446660758