Year Percent of GDP 2004-01-01 4.4565 2005-01-01 5.1798 2006-01-01 4.7166 2007-01-01 4.5958 2008-01-01 4.6763 2009-01-01 5.5750 2010-01-01 7.0537 2011-01-01 8.9249 2012-01-01 12.0613 2013-01-01 17.5203 2014-01-01 17.8361 2015-01-01 20.0985 2016-01-01 23.2202