Year Percent of GDP 2004-01-01 2.1555 2005-01-01 2.1106 2006-01-01 2.2300 2007-01-01 2.2729 2008-01-01 2.3864 2009-01-01 2.6643 2010-01-01 3.7366 2011-01-01 3.8862 2012-01-01 4.3860 2013-01-01 4.1971 2014-01-01 4.3321