Year	constant 2010 US$
1991	8971.5593102914
1992	9777.58640955268
1993	11391.9021747473
1994	12392.7048011203
1995	12739.0887873769
1996	13234.7643531259
1997	13952.8100140317
1998	12578.8606797206
1999	12775.0399759897
2000	13402.97015736
2001	13081.2054123283
2002	13341.2310354375
2003	13360.2807555158
2004	13516.8820136988
2005	14186.6296285147
2006	14926.5387754435
2007	16800.6710785817
2008	17783.4698659046
2009	17116.1515102814
2010	17960.1681478958
2011	17991.4127494412
2012	18676.4537852175
2013	18984.9733694307
2014	19356.6310876612
2015	19859.0136000244
2016	20293.2145271213
2017	21083.7729735151
2018	21973.1546045453