Year Percent of GDP 2004-01-01 2.2566 2005-01-01 2.2994 2006-01-01 3.8341 2007-01-01 5.1521 2008-01-01 4.9073 2009-01-01 3.1797 2010-01-01 3.5125 2011-01-01 3.1630 2012-01-01 3.3979 2013-01-01 3.8057 2014-01-01 3.7537 2015-01-01 3.5834 2016-01-01 3.7028