Year Percent of GDP 1996-01-01 1.14 1997-01-01 1.23 1998-01-01 1.52 1999-01-01 1.52 2000-01-01 1.72 2001-01-01 2.13 2002-01-01 2.38 2003-01-01 2.49 2004-01-01 2.66 2005-01-01 2.47 2006-01-01 3.02 2007-01-01 3.72 2008-01-01 3.69 2009-01-01 3.41 2010-01-01 3.71 2011-01-01 4.37 2012-01-01 5.16 2013-01-01 5.83