Year	constant 2011 international $
1990	5880.43251840834
1991	5514.39980214871
1992	6318.96949767698
1993	6331.66467230552
1994	6354.42627731818
1995	6562.81845607648
1996	6488.71992742228
1997	6650.93283965972
1998	6803.81706301472
1999	6900.42736928759
2000	7312.36056059722
2001	7606.90889191526
2002	7803.75109743723
2003	7997.35644826519
2004	8513.63589396755
2005	8910.00528042658
2006	9302.60368661155
2007	9725.98132345105
2008	9826.92018877636
2009	9830.39334288501
2010	9306.14180443909
2011	9040.83041728969
2012	8759.33538708269
2013	8574.25873593238
2014	8431.95073630929
2015	8307.78852445229
2016	8253.3352121411
2017	8253.49247055428
2018	8267.80554454589