Year Percent of GDP 2004-01-01 2.1354 2005-01-01 2.1848 2006-01-01 2.4531 2007-01-01 2.5857 2008-01-01 2.3142 2009-01-01 2.3292 2010-01-01 2.2952 2011-01-01 3.0454 2012-01-01 3.1614 2013-01-01 3.3172 2014-01-01 3.3738 2015-01-01 3.5412 2016-01-01 3.7093