Year	constant 2011 international $
1990	3809.40180847326
1991	4000.48249373515
1992	3860.23918243475
1993	3744.05435642542
1994	4095.47789361594
1995	3797.2895007102
1996	4240.24202704504
1997	4113.98857884151
1998	4382.60447064986
1999	4377.856868122
2000	4402.12325362321
2001	4673.31623261139
2002	4776.73527174439
2003	5011.52120176181
2004	5210.94078376704
2005	5348.5331520979
2006	5680.49520078125
2007	5823.74860575962
2008	6104.31684865434
2009	6210.30026924312
2010	6365.76631501033
2011	6590.79631781545
2012	6670.94325680563
2013	6922.95234122276
2014	6938.92247861403
2015	7182.75270350422
2016	7168.99691741042
2017	7341.50558827773
2018	7479.59206713591