Year	constant 2015 US$
1991	3615.7850309295063
1992	3592.189399068274
1993	3612.843557179113
1994	3673.110356291313
1995	3700.1772308618642
1996	3622.1202151730404
1997	3648.1952181700935
1998	3639.116670999405
1999	3596.8007956881934
2000	3557.0604075655096
2001	3506.3123116151755
2002	3519.736980711845
2003	3361.803118133164
2004	3335.9006807946935
2005	3326.261436637348
2006	3136.493855718855
2007	3212.92017271313
2008	3160.3183052358377
2009	3222.8170753559725
2010	3254.7266424179966
2011	3403.753781172546
2012	3503.0789184018504
2013	3677.2029547363263
2014	3643.4155991305106
2015	3795.0548834061824
2016	3855.4166781124354
2017	4037.356787155941
2018	4128.607664988557
2019	4199.98690005864
2020	4165.341210684858
2021	4180.227488556513
2022	4146.124076710007