Year	constant 2015 US$
1990	3568.0635685747006
1991	3360.1953652145435
1992	3168.6273120879723
1993	2962.978230694683
1994	2932.0793590159483
1995	2897.193767465543
1996	2916.443299572588
1997	2954.5238308874996
1998	3038.1398338256863
1999	3154.849182400057
2000	3283.3793409535137
2001	3169.3251436893106
2002	3240.11064526089
2003	3307.92040834712
2004	3473.765448114508
2005	3657.563076992162
2006	3866.7465062297724
2007	4140.633548093642
2008	4392.550716415098
2009	4405.200457508667
2010	4582.36517512347
2011	4711.130278700812
2012	4708.051685359227
2013	4863.680886669677
2014	5053.750012363666
2015	5262.686719286744
2016	5429.946783583586
2017	5510.81862920922
2018	5698.393344844888
2019	5961.5847539919105
2020	5743.726494245812
2021	6064.923151200224
2022	6217.951641204279
2023	6350.243407160681