Year	constant 2015 US$
1995	3133.2312997568006
1996	3343.550284810957
1997	3560.427842428524
1998	3629.033367323491
1999	3780.9151524243453
2000	3898.8968587155296
2001	4151.932466865474
2002	4458.917007439924
2003	4865.705423669825
2004	5422.19233311518
2005	6049.535011110098
2006	7230.6392067347
2007	8112.683425616808
2008	7520.964000157429
2009	6445.629629445281
2010	6720.039954216409
2011	6838.8423089385715
2012	7314.2521130497125
2013	7873.656334430552
2014	8006.159925276822
2015	8253.164606945193
2016	8619.845874912427
2017	8951.128495339022
2018	9294.539979162406
2019	9361.390878523072
2020	9020.064023528528
2021	9759.09343545555
2022	10491.263053986868
2023	10223.584596582634