Year	constant 2011 international $
1990	20686.1367611483
1991	21072.9332724706
1992	21058.96205484
1993	20600.4767595964
1994	20907.5390114597
1995	21247.0408971018
1996	21759.0612321488
1997	22622.9137945759
1998	23374.1527731618
1999	24000.1358885311
2000	24839.0759062479
2001	25731.2092719044
2002	26642.768959863
2003	28119.4073558205
2004	29469.5266005245
2005	29559.2813870956
2006	31136.4469589464
2007	32073.9603960134
2008	31881.7123475428
2009	30430.419418438
2010	28726.0792836873
2011	26141.3195918975
2012	24364.2690631745
2013	23746.0845699961
2014	24081.6305378246
2015	24134.6844088562
2016	24188.9949355739
2017	24601.6732265416
2018	25140.7031489628