Year	constant 2015 US$
1991	5792.369215740453
1992	5596.289869620946
1993	5225.892241357808
1994	4576.392271437646
1995	4624.030425657957
1996	4996.457358561013
1997	5089.123965598312
1998	5165.078198630064
1999	5238.947351870192
2000	5348.900729132563
2001	5264.033355485854
2002	5201.056132148143
2003	5237.058005719409
2004	5096.424512739146
2005	5087.145270651868
2006	5059.793421853484
2007	5109.311685755429
2008	5231.45975904362
2009	5331.990709540383
2010	4946.0415141309595
2011	5068.301425733308
2012	4968.450256650132
2013	4976.155464300989
2014	4927.122134160928
2015	4878.81111974741
2016	4851.988930201446
2017	4817.462081947917
2018	4783.266016383038
2019	4772.843912771494
2020	4805.2138401737075
2021	4570.391705382833
2022	4345.487410784344