Year Percent of GDP 2004-01-01 3.6113 2005-01-01 3.6787 2006-01-01 3.8130 2007-01-01 5.0207 2008-01-01 5.8643 2009-01-01 6.5581 2010-01-01 6.8609 2011-01-01 5.9735 2012-01-01 6.6311 2013-01-01 7.4669 2014-01-01 7.1208 2015-01-01 8.3001 2016-01-01 8.6004