Year Percent of GDP 2004-01-01 18.2577477270462 2005-01-01 19.3226003056674 2006-01-01 17.7758012852929 2007-01-01 21.6082529584763 2008-01-01 19.8850988294490 2009-01-01 23.2291522468668 2010-01-01 19.2381228273465 2011-01-01 20.1281269172000 2012-01-01 19.4556090699390 2013-01-01 20.3548290395013 2014-01-01 19.4402750307740 2015-01-01 24.9230862184632 2016-01-01 21.2589952985428 2017-01-01 24.4213876701520 2018-01-01 23.7137284205641 2019-01-01 21.2821466420444