Year	constant 2010 US$
1997	60713.0633639353
1998	64598.3163966503
1999	69618.4517920887
2000	70336.1605291872
2001	73306.6233261549
2002	72609.2967420196
2003	74404.6842715271
2004	76801.326219582
2005	77600.2643488612
2006	79571.9044287615
2007	84216.2543096583
2008	84562.3979715959
2009	72803.7306617617
2010	68496.3606802049
2011	61183.8584586729
2012	55783.1010656603
2013	53346.9745703882
2014	52233.052890043
2015	52034.7581864891
2016	52811.2787970763
2017	53337.5878675864