Year	constant 2010 US$
1991	19703.0124745395
1992	21550.1185318924
1993	22265.6694634869
1994	22719.1244131407
1995	22481.2697485921
1996	24531.4170309894
1997	23840.9738018517
1998	23870.993813393
1999	22649.3636947898
2000	22403.444524706
2001	22411.9375460682
2002	20880.7605769235
2003	19744.3581105107
2004	22443.4336825245
2005	22393.0604583915
2006	22318.4947645637
2007	23421.7073099383
2008	24679.603683222
2009	26318.3561517668
2010	27536.602884653
2011	26360.4672540608
2012	25314.0995668793
2013	24385.784308399
2014	23547.3561031376
2015	22796.5930512327
2016	21888.0776702408
2017	21413.0299676343
2018	21479.7995833585