Quarter	Percent
2005-01-01	40.6
2005-04-01	40.0
2005-07-01	39.7
2005-10-01	40.0
2006-01-01	40.4
2006-04-01	39.8
2006-07-01	39.5
2006-10-01	39.8
2007-01-01	40.3
2007-04-01	39.8
2007-07-01	39.6
2007-10-01	39.8
2008-01-01	40.2
2008-04-01	39.6
2008-07-01	39.4
2008-10-01	39.8
2009-01-01	40.2
2009-04-01	39.8
2009-07-01	39.7
2009-10-01	40.1
2010-01-01	40.4
2010-04-01	39.9
2010-07-01	39.8
2010-10-01	40.3
2011-01-01	40.6
2011-04-01	40.0
2011-07-01	39.9
2011-10-01	40.2
2012-01-01	40.6
2012-04-01	39.9
2012-07-01	39.8
2012-10-01	40.1
2013-01-01	40.5
2013-04-01	39.9
2013-07-01	39.9
2013-10-01	40.2
2014-01-01	40.6
2014-04-01	40.2
2014-07-01	40.0
2014-10-01	40.3
2015-01-01	40.6
2015-04-01	40.2
2015-07-01	40.1
2015-10-01	40.2
2016-01-01	40.4
2016-04-01	40.0
2016-07-01	39.8
2016-10-01	40.0
2017-01-01	40.3
2017-04-01	39.8