Year constant 2011 international $ 2006 23601751678.8232 2007 25284512834.5808 2008 26594584027.0865 2009 25420079922.6404 2010 25441914659.4821 2011 25394168184.8002 2012 25231942599.066 2013 25244906160.4408 2014 25734242140.0652 2015 26194489989.7799 2016 26789558167.7196 2017 27208464398.8927 2018 27595220903.18