Year	constant 2015 US$
1991	3145.2456479041957
1992	3240.217916866485
1993	3553.35001021968
1994	3609.6653480862465
1995	3694.477682227706
1996	4037.265322556846
1997	4333.268611847118
1998	4651.130825258278
1999	4738.198446091565
2000	5025.628486734235
2001	4944.638496496924
2002	4942.48323077721
2003	5130.653176486118
2004	5199.94732907168
2005	5556.317292325323
2006	5320.462611289404
2007	5288.485276576039
2008	5170.262491092962
2009	5531.716476062764
2010	5852.708453457373
2011	6953.6042750909155
2012	7102.608156480461
2013	7257.874070356291
2014	7998.980753636108
2015	8550.428156232998
2016	9205.71873798157
2017	9784.276888422384
2018	10489.077239562366
2019	10974.886051583513
2020	9480.352633555107
2021	9862.371178781601
2022	8787.132491362061