Year Percent of GDP 2009-01-01 22.1507 2010-01-01 21.1660 2011-01-01 19.6073 2012-01-01 18.4420 2013-01-01 18.6151 2014-01-01 21.6104 2015-01-01 21.6784 2016-01-01 25.5083 2017-01-01 23.7598 2018-01-01 24.0300 2019-01-01 23.9373