Year Percent of GDP 2004-01-01 5.5249 2005-01-01 8.0821 2006-01-01 9.9247 2007-01-01 14.2962 2008-01-01 14.5764 2009-01-01 13.6670 2010-01-01 13.2815 2011-01-01 13.8272 2012-01-01 12.3785 2013-01-01 15.1880