Year	constant 2015 US$
1991	7554.8462821109615
1992	7789.496972351549
1993	7766.612223515367
1994	8908.172330584337
1995	9350.76877089128
1996	9972.605687103462
1997	10030.543587292199
1998	10078.610287729323
1999	10062.029975566811
2000	10720.359530605532
2001	11558.418670952062
2002	12425.159814839117
2003	13674.801969849399
2004	14498.278204307779
2005	15650.98206543838
2006	16834.789313573994
2007	18572.10677565446
2008	18290.393247139375
2009	17225.08845420029
2010	17897.46029216519
2011	18711.271838198234
2012	20313.379911826243
2013	21209.981274608082
2014	21456.61563904957
2015	20759.526153201514
2016	20326.953452445316
2017	20439.439666066566
2018	20790.825447559997
2019	21372.20925984953
2020	20344.24500784072
2021	20929.56982744773
2022	20982.573939768678