Year Percent of GDP 2004-01-01 46.2975731528282 2005-01-01 38.7279490422303 2006-01-01 39.0803576465046 2007-01-01 36.3801206150890 2008-01-01 37.2584451248224 2009-01-01 32.3509808872796 2010-01-01 28.9902798586767 2011-01-01 27.3298798141337 2012-01-01 29.4298451471572 2013-01-01 33.0425188253585 2014-01-01 31.1877266314094 2015-01-01 35.7784638105946 2016-01-01 34.7825261102057 2017-01-01 33.4079948664923 2018-01-01 33.9636609195003 2019-01-01 37.0239925031967