Year	constant 2010 US$
1991	12228.1404728662
1992	13219.0561498817
1993	13780.7025067911
1994	13038.600252174
1995	14051.165199214
1996	14159.4311486801
1997	13822.3135438901
1998	13807.6664677109
1999	13968.2075827716
2000	11637.2798813762
2001	11680.1481639489
2002	12024.4307505258
2003	12609.8055492838
2004	13691.8404972451
2005	14398.4926047365
2006	14936.1659535408
2007	15357.1310774352
2008	15422.7233740957
2009	15600.8845738085
2010	15577.2481889557
2011	15408.4714851805
2012	15214.5882056204
2013	15975.1570789101
2014	16194.0197747671
2015	15865.9740183769
2016	16178.4713036168
2017	16042.8935547644
2018	15762.8442515137