Year	Percent of GDP
2004-01-01	20.7235
2005-01-01	23.1737
2006-01-01	25.1206
2007-01-01	26.7592
2008-01-01	28.6653
2009-01-01	29.1202
2010-01-01	30.9213
2011-01-01	31.6991
2012-01-01	36.9457
2013-01-01	38.1215
2014-01-01	38.3568
2015-01-01	38.3746
2016-01-01	37.7827