Year	constant 2015 US$
1991	16401.04335077343
1992	18675.201934351197
1993	20074.12207491337
1994	21172.197165837297
1995	21441.057154319547
1996	23601.57786179768
1997	22877.826697016277
1998	22653.533583046014
1999	21404.835811669895
2000	21371.245366921707
2001	21762.607473584438
2002	20920.661509963837
2003	20480.951487021994
2004	24502.673764926363
2005	24814.013186548276
2006	24835.626252574457
2007	25940.25015139034
2008	26619.498504055107
2009	27773.07155312519
2010	29437.93552346882
2011	29086.610261193982
2012	28453.9604622566
2013	26621.60854573525
2014	24555.01994280456
2015	24268.62415880911
2016	25112.65020439552
2017	25942.868159496775
2018	26294.894623703287
2019	25706.95464761563
2020	24352.576381422085
2021	22644.282935740797
2022	22484.211875502584