Year	constant 2015 US$
1991	4063.4284337763447
1992	3156.60669533225
1993	3001.07389614328
1994	3704.7541584059218
1995	3720.0425564414822
1996	4555.752617038317
1997	4516.744872440568
1998	4504.771998355321
1999	5112.194639924298
2000	5501.491971695513
2001	4917.072581199935
2002	5887.292375454619
2003	5850.297446532476
2004	6216.747001575572
2005	6837.120292209788
2006	6848.027186622467
2007	6391.90193074499
2008	4456.370158182493
2009	4580.032465997469
2010	4879.426254386038
2011	4991.900633780719
2012	5512.990527511917
2013	3645.792477486627
2014	4103.482771399753
2015	4414.506270691038
2016	5590.81239940709
2017	5262.650282145374
2018	5040.462983842721
2019	4920.441917050143
2020	5311.267561137747
2021	5286.188207623297
2022	5246.537709052453