Year Percent of GDP 2004-01-01 32.8148315647245 2005-01-01 28.3177201359728 2006-01-01 24.4151702991540 2007-01-01 20.3633368549310 2008-01-01 19.9014088437643 2009-01-01 20.9278553132290 2010-01-01 21.5174530151782 2011-01-01 22.3547633878182 2012-01-01 21.1052283163608 2013-01-01 19.3045839607800 2014-01-01 22.8224947567476 2015-01-01 24.5765812706421 2016-01-01 26.1081216580479 2017-01-01 26.8812749451542 2018-01-01 28.3183839946722 2019-01-01 29.1487799930778