Year	Percent
2004-01-01	17.1430
2005-01-01	18.7687
2006-01-01	18.9003
2007-01-01	19.0062
2008-01-01	18.3263
2009-01-01	18.6648
2010-01-01	17.0999
2011-01-01	16.7597
2012-01-01	16.2920
2013-01-01	15.8602
2014-01-01	16.1417