Year Percent of GDP 2004-01-01 17.3331487355049 2005-01-01 12.6575038065359 2006-01-01 11.9293168408437 2007-01-01 11.0328691078080 2008-01-01 12.8865072581910 2009-01-01 15.8572480036580 2010-01-01 15.7546254082024 2011-01-01 17.9120610323965 2012-01-01 15.7191467061938 2013-01-01 16.4307710731084 2014-01-01 17.8951628820614 2015-01-01 21.1962835038381 2016-01-01 21.8042737714179 2017-01-01 16.0758741572854 2018-01-01 18.9964425604193 2019-01-01 18.4428321061713