Year	constant 2011 international $
1990	11372.8231076423
1991	12238.7888472347
1992	13032.793286462
1993	13919.4038997753
1994	14546.5387867258
1995	13959.9996570558
1996	14556.7335748029
1997	15556.0175645669
1998	15973.0672585851
1999	15261.4419922845
2000	14975.3033216
2001	14159.5848404901
2002	12480.9976567284
2003	13439.1071255147
2004	14498.7723316514
2005	15619.451344
2006	16705.8696830038
2007	18029.6825798292
2008	18575.8877229221
2009	17302.6541492773
2010	18911.8231883276
2011	19817.4504765479
2012	19392.3097931241
2013	19637.7553833376
2014	18935.0024966208
2015	19243.5794686236
2016	18645.0918508457
2017	18945.1440219822
2018	18282.0939276744