Year Percent of GDP 2004-01-01 30.0656881256111 2005-01-01 28.1406723805879 2006-01-01 26.7642764862105 2007-01-01 29.5049147343941 2008-01-01 32.4502218031765 2009-01-01 32.8798354074837 2010-01-01 30.1527702071581 2011-01-01 24.4915347915057 2012-01-01 26.4736185425485 2013-01-01 28.0210010098639 2014-01-01 31.5863605693428 2015-01-01 32.9764241935037 2016-01-01 36.0052675414736 2017-01-01 36.9520543521311 2018-01-01 37.2720703033254 2019-01-01 33.9710720448030