Year constant 2011 international $ 1995 8344.81789569872 1996 8630.17838721356 1997 9506.42147305488 1998 10213.7637864565 1999 10401.5318073847 2000 11161.774215651 2001 12087.2507051678 2002 13080.2320088862 2003 14230.2049108521 2004 15344.6006246214 2005 17346.5801274647 2006 19304.8338436571 2007 21283.8454312123 2008 21111.4762008464 2009 19928.9132265937 2010 18481.4976003371 2011 19767.9633767412 2012 20686.8737471628 2013 21518.4922108514 2014 22093.7319668724 2015 22889.9011142495 2016 23647.7506077056 2017 24853.3235366394