Year Percent of GDP 2010-01-01 56.6753 2011-01-01 58.9000 2012-01-01 59.7567 2013-01-01 60.4192 2014-01-01 59.2062 2015-01-01 58.5642 2016-01-01 56.4569 2017-01-01 53.3423