Year	Percent
2006-01-01	15.3306132272467
2007-01-01	15.4300346718835
2008-01-01	15.9291832118179
2009-01-01	16.5094130492796
2010-01-01	17.8732974294880
2011-01-01	19.1093446628516
2012-01-01	19.7417094220682
2013-01-01	20.4150287226415
2014-01-01	20.2628475762550