Year	constant 2015 US$
1991	19968259822.970844
1992	19756388633.617653
1993	21693461029.418354
1994	20090151915.72768
1995	18945206877.10883
1996	18416016754.2266
1997	18226225018.571064
1998	17771766622.215466
1999	18065105206.16112
2000	18823538256.37905
2001	19572008269.714413
2002	20646408849.66841
2003	21699014615.198742
2004	21886508014.64206
2005	22324534381.069164
2006	22727631049.01865
2007	21757690207.906353
2008	22422102691.23715
2009	22586519649.52163
2010	22543685392.856186
2011	22628057959.60012
2012	22319891169.1264
2013	23015077013.952908
2014	24205010158.144867
2015	24676695336.203274
2016	24859205427.22383
2017	25543332766.50587
2018	25998184958.785683
2019	27538675234.711327
2020	27513858931.560066
2021	28016764966.482605
2022	28834192226.110466
2023	29173264836.708946