Year Percent of GDP 2004-01-01 58.9879 2005-01-01 57.8980 2006-01-01 58.9425 2007-01-01 59.7388 2008-01-01 60.6456 2009-01-01 64.3882 2010-01-01 68.0769 2011-01-01 66.8222 2012-01-01 61.8164 2013-01-01 59.6545 2014-01-01 54.1697 2015-01-01 47.1653 2016-01-01 44.5578 2017-01-01 44.6491