Year Percent of GDP 2006-01-01 8.5407 2007-01-01 10.5600 2008-01-01 12.3014 2009-01-01 12.7813 2010-01-01 13.3289 2011-01-01 14.1262 2012-01-01 14.3597 2013-01-01 14.5834 2014-01-01 15.4164 2015-01-01 16.7772