Year	constant 2010 US$
1991	19137.4711194183
1992	26077.7668486757
1993	18829.355369557
1994	14736.3147991682
1995	13793.0625846913
1996	13844.0976828369
1997	12526.8630462845
1998	14030.3377852403
1999	9874.46942998507
2000	10327.2489041501
2001	10553.7373282029
2002	13260.6436787891
2003	14141.0501458872
2004	14980.9471082866
2005	14731.8978101982
2006	16191.5716772072
2007	15195.5913498125
2008	15907.0724454571
2009	16991.0949199163
2010	17620.0649062296
2011	17846.6116812853
2012	15658.2650685982
2013	14914.843680648
2014	15265.7165883653
2015	15648.8102776302
2016	16222.4061103365
2017	16559.1688040185
2018	16881.5295424264