Year	constant 2015 US$
1991	4055.0615405016947
1992	4075.534343495137
1993	4122.351816766971
1994	4335.805461076143
1995	4176.644180599822
1996	4469.202602526965
1997	4260.217363095022
1998	4679.432929309397
1999	4542.975008684448
2000	4658.806267080488
2001	4889.800348555304
2002	5293.948767230173
2003	5212.132775555278
2004	5062.61017939936
2005	5375.649772662995
2006	5701.927291019931
2007	5399.762691898118
2008	5185.829454238494
2009	5714.1566281828245
2010	6041.4994231825
2011	6476.71396418688
2012	6749.881971965682
2013	7114.750024279201
2014	7200.056635813869
2015	7416.502179945584
2016	7477.414263196861
2017	7660.336507157883
2018	8180.361817123732
2019	8806.80515280658
2020	9516.297451343316
2021	9528.087303603983
2022	9379.101537600849