Year	constant 2015 US$
1991	9508.20131344107
1992	10694.375014771162
1993	10797.790575693925
1994	10872.34343122562
1995	11495.49875114874
1996	12382.425082079773
1997	12873.51016029912
1998	12455.471586015441
1999	13371.439877911096
2000	13451.781524014126
2001	14307.92094349
2002	15585.356333736792
2003	16038.923681614357
2004	15933.527226933777
2005	14776.569283151528
2006	14675.885397742391
2007	14866.799488362954
2008	14658.922024486306
2009	16260.099453234929
2010	16394.23015359175
2011	16803.549555276095
2012	18232.9465332462
2013	18204.32294625796
2014	18835.646056787118
2015	18654.947820711463
2016	17055.139249027507
2017	18127.257330619635
2018	19095.770507766534
2019	18939.75713930988
2020	21961.825924534907
2021	19071.465694637278
2022	19971.56152758203