Year	constant 2010 US$
1991	11170.8618179397
1992	11595.5163520024
1993	12108.4885649616
1994	12480.6919755352
1995	13354.2810788016
1996	13179.7315052381
1997	13500.0184240661
1998	14126.2424975202
1999	14506.3284378114
2000	15988.5730894925
2001	15548.8940475991
2002	15734.1368405654
2003	16754.088134109
2004	16536.8963192846
2005	17055.4149317091
2006	17771.8542387424
2007	18671.1208333256
2008	19067.5099745411
2009	18804.8996865971
2010	19090.5803360904
2011	19705.0843464852
2012	20334.6075428975
2013	20597.1647604336
2014	21288.3117316258
2015	21880.36745598
2016	22760.8670233932
2017	23534.8263156747
2018	24404.8412848873