Year	Percent of GDP
2004-01-01	15.7672
2005-01-01	18.0528
2006-01-01	20.4393
2007-01-01	22.9145
2008-01-01	20.4116
2009-01-01	22.8550
2010-01-01	25.5830
2011-01-01	26.9035
2012-01-01	29.2262
2013-01-01	31.2750
2014-01-01	33.1157
2015-01-01	34.5859
2016-01-01	36.4119
2017-01-01	38.4952