Year	constant 2015 US$
1991	15484.40879754879
1992	15639.511513662228
1993	15939.384492693518
1994	16648.430623335516
1995	15941.810195149355
1996	16841.507392685424
1997	16652.320586331913
1998	16432.85643311129
1999	16393.340314728288
2000	16591.43955726031
2001	15462.749768406422
2002	15584.922978862485
2003	15145.478970287153
2004	14825.097436321386
2005	15381.885374211462
2006	15905.360553885615
2007	16327.793994902357
2008	16946.727775593143
2009	15051.194701196484
2010	16310.605072596245
2011	15030.966960079864
2012	15187.334624703724
2013	15539.465197927388
2014	15807.545822151062
2015	16190.02964511839
2016	16089.888204039893
2017	16189.436864622221
2018	16402.347597750148
2019	15899.497594895643
2020	14856.348397357295
2021	15949.619526267836
2022	16266.646917061653