Year constant 2011 international $ 1995 13244.6707110949 1996 14148.6691229138 1997 14875.7280411196 1998 15443.1486334022 1999 15298.4048928425 2000 15512.700210894 2001 16149.727623649 2002 16812.5487141021 2003 16873.5680078644 2004 17965.3764530786 2005 19432.6091534152 2006 21030.3858308814 2007 23310.2979805963 2008 24895.7359257512 2009 23800.605166629 2010 24584.5777688591 2011 24895.7362278852 2012 25716.2718193974 2013 26328.3511292057 2014 26939.1672849767 2015 27693.1435979024 2016 28705.5473023696 2017 29544.4855948575