Year Percent of GDP 2005-01-01 12.2200 2006-01-01 15.3482 2007-01-01 20.6378 2008-01-01 18.9537 2009-01-01 19.6195 2010-01-01 17.4290 2011-01-01 19.3767 2012-01-01 24.1038 2013-01-01 28.5034