Year Percent of GDP 2004-01-01 8.6295 2005-01-01 8.7819 2006-01-01 11.7306 2007-01-01 17.7650 2008-01-01 23.0518 2009-01-01 23.5921 2010-01-01 26.7513 2011-01-01 32.0061 2012-01-01 40.7906 2013-01-01 41.6724 2014-01-01 52.5596 2015-01-01 61.6622