Year	constant 2010 US$
1991	3521.01118695336
1992	3493.52610461199
1993	3529.11805478617
1994	3688.70636389932
1995	3592.50954416855
1996	3935.2796806029
1997	3805.21795853171
1998	4168.82381182263
1999	4124.02216107034
2000	3982.44979094822
2001	4076.05997743614
2002	4325.34304690362
2003	4260.76912427183
2004	4155.39324336743
2005	4365.81918030582
2006	4682.07773431193
2007	4479.4335766234
2008	4268.67791401889
2009	4729.66291322168
2010	5082.27723182869
2011	5339.97545676011
2012	5548.02841889557
2013	5771.52581897508
2014	5973.63782197051
2015	6169.83495528394
2016	6070.84682442145
2017	6208.71263205267
2018	4273.18396601805