Year	Percent
2005-01-01	70.5
2006-01-01	70.5
2007-01-01	70.4
2008-01-01	70.4
2009-01-01	69.8
2010-01-01	69.5
2011-01-01	69.3
2012-01-01	69.2
2013-01-01	68.9
2014-01-01	68.8
2015-01-01	68.7
2016-01-01	68.8