Year Percent of GDP 2004-01-01 1.2141 2005-01-01 1.5291 2006-01-01 2.0039 2007-01-01 2.3561 2008-01-01 2.5289 2009-01-01 2.8827 2010-01-01 2.7204 2011-01-01 3.1193 2012-01-01 3.4311 2013-01-01 4.1011 2014-01-01 4.4680 2015-01-01 4.9632 2016-01-01 5.2979 2017-01-01 5.7125