Year Percent of GDP 2004-01-01 2.76927598586059 2005-01-01 2.53291386711433 2006-01-01 2.20882522210885 2007-01-01 2.38779960252776 2008-01-01 3.05120875310381 2009-01-01 3.91651614553382 2010-01-01 4.22703797413766 2011-01-01 4.84325004177948 2012-01-01 5.80060092624629 2013-01-01 5.87529457823040 2014-01-01 7.64848832324657 2015-01-01 8.35242362075130 2016-01-01 8.57777664287542 2017-01-01 8.64587229156328