Year	constant 2010 US$
1991	26503.0276373378
1992	26395.7953332615
1993	24289.9400963923
1994	17835.7358332517
1995	18528.7776251452
1996	20904.9874410582
1997	21133.0168847362
1998	21824.4550450232
1999	22612.101533309
2000	23325.4585818028
2001	22548.5897177358
2002	23575.2904518607
2003	24984.900724237
2004	34681.7348512306
2005	24518.4392839467
2006	23693.9150933349
2007	29142.2744980864
2008	43726.5101161949
2009	44927.4986840335
2010	34356.8753270084
2011	30722.7505363305
2012	31879.4765482936
2013	35793.5725569398
2014	40967.3314007674
2015	35535.5657946025
2016	36476.7780272377
2017	38137.0389654351
2018	37411.9138228455