Year constant 2011 international $ 2005 13785.6259978578 2006 13357.9345798122 2007 13771.9856202765 2008 13114.8691467698 2009 13342.3789656379 2010 13538.8548553453 2011 14509.6664305789 2012 14922.9230641267 2013 14267.3884451258 2014 15091.6829266492 2015 16044.6793963687 2016 16325.4328060241 2017 15980.6054963472