Quarter	Percent
2004-01-01	12.0
2004-04-01	12.4
2004-07-01	12.2
2004-10-01	11.5
2005-01-01	11.6
2005-04-01	12.0
2005-07-01	11.8
2005-10-01	11.3
2006-01-01	11.3
2006-04-01	11.3
2006-07-01	11.8
2006-10-01	10.7
2007-01-01	10.7
2007-04-01	10.6
2007-07-01	11.3
2007-10-01	10.5
2008-01-01	10.5
2008-04-01	11.5
2008-07-01	12.4
2008-10-01	11.4
2009-01-01	13.1
2009-04-01	14.5
2009-07-01	15.6
2009-10-01	14.1
2010-01-01	14.3
2010-04-01	15.5
2010-07-01	15.6
2010-10-01	14.7
2011-01-01	15.0
2011-04-01	15.0
2011-07-01	15.5
2011-10-01	13.9
2012-01-01	14.5
2012-04-01	14.6
2012-07-01	15.0
2012-10-01	14.4
2013-01-01	14.7
2013-04-01	14.6
2013-07-01	14.3
2013-10-01	13.2
2014-01-01	13.4
2014-04-01	12.6
2014-07-01	13.2
2014-10-01	12.2
2015-01-01	12.0
2015-04-01	11.8
2015-07-01	11.8
2015-10-01	10.4
2016-01-01	10.8
2016-04-01	11.1
2016-07-01	11.0
2016-10-01	9.6
2017-01-01	9.6
2017-04-01	9.6
2017-07-01	9.8