Year constant 2010 US$ 2006 8789346799.87456 2007 10694820752.8312 2008 13329155284.2858 2009 11656240381.8694 2010 14768574004.1929 2011 20687766635.7551 2012 23332918227.7107 2013 23863291381.0795 2014 20415065107.4549 2015 22034451742.4366 2016 21782666894.059 2017 23504727609.9361