Year	constant 2015 US$
1991	3921.4286018167663
1992	4069.2600470910584
1993	3876.5010294937347
1994	3449.4164561554203
1995	3479.654495792129
1996	3439.7427312636632
1997	3311.813329740391
1998	3022.966222681361
1999	3513.6262723368145
2000	3317.2562778380266
2001	3066.0119699704137
2002	3229.3278161108287
2003	3304.4392077819707
2004	3168.8260311296594
2005	3037.5590178369785
2006	3242.7867213213535
2007	3563.685702456078
2008	3392.547122330123
2009	2900.663698835079
2010	2971.093458922719
2011	2699.9813228146695
2012	2815.589896587224
2013	2738.923947798546
2014	2913.584037757522
2015	2847.2537103381887
2016	2942.3529457722166
2017	2962.212438727644
2018	3182.341523620281
2019	3221.372320231047
2020	3363.0999826456446
2021	3479.7396566040516
2022	3288.037329129121