Year	constant 2010 US$
1995	7313.74090418016
1996	7817.60463830299
1997	8840.26105693513
1998	9293.07550974244
1999	9186.39295449766
2000	10108.2052912574
2001	10816.6031531195
2002	11546.7726523663
2003	12481.1896137323
2004	13346.3983138309
2005	14681.2253747477
2006	16285.0067216
2007	17627.0297205183
2008	16716.5031632479
2009	14282.6034990097
2010	14638.6048173457
2011	15798.6327787681
2012	16538.2125958308
2013	16918.5871147773
2014	17453.0029161383
2015	17773.0055158794
2016	18387.7690698739
2017	19257.476165889
2018	19948.9228330488