Year Percent of GDP 2004-01-01 28.6963352503453 2005-01-01 33.0950146567131 2006-01-01 40.1727713705202 2007-01-01 37.3609552964482 2008-01-01 39.5403981261845 2009-01-01 33.1850115089753 2010-01-01 38.3340102647154 2011-01-01 42.1662949869554 2012-01-01 44.9671757321667 2013-01-01 47.0136676191363 2014-01-01 48.0589914319525 2015-01-01 41.3207936888593 2016-01-01 44.8796168303371 2017-01-01 47.9185949535256 2018-01-01 50.9643532896058 2019-01-01 52.0363835242323