Year	constant 2011 international $
1990	5820.98863033088
1991	6212.82532518928
1992	6324.43767195358
1993	6104.91989155819
1994	6051.36697209585
1995	6289.27316738247
1996	6234.74794839405
1997	6351.64809488268
1998	6473.73658652248
1999	6402.29522046403
2000	6720.24519138108
2001	6640.74736111211
2002	6965.45277224046
2003	7379.15556927268
2004	7867.56674357661
2005	7732.21268835633
2006	8204.98506438656
2007	8245.80566544791
2008	8323.77412016125
2009	8175.84286545328
2010	8347.65796917892
2011	8718.01685132082
2012	8862.60853408377
2013	9533.64651162139
2014	10011.1611027782
2015	10402.1130303614
2016	10170.8734706891
2017	9778.92370278733
2018	9682.66177353533