Year	constant 2015 US$
1990	6723.432254475151
1991	6007.751869286022
1992	5726.030486781502
1993	5741.070628964396
1994	5953.746900804991
1995	6289.728483709471
1996	6589.996342893983
1997	6755.047322410567
1998	6947.751714926455
1999	7091.75562397155
2000	7414.047195168123
2001	7698.370112679262
2002	8028.871421989653
2003	8383.32231320605
2004	8897.308496772113
2005	9369.402475259565
2006	10012.732416890076
2007	10696.665765302145
2008	11157.548021765737
2009	10786.994096636328
2010	10981.641138742096
2011	11394.556425258583
2012	11515.034537733327
2013	11616.689297324669
2014	12015.45659116339
2015	12528.08264308758
2016	12905.9526304618
2017	13597.881540122251
2018	14298.548021864139
2019	14877.710568058976
2020	14399.983105040219
2021	15442.301800989588
2022	16307.984401283447
2023	16383.52064312704