Quarter	Percent
2000-04-01	11.5
2001-04-01	10.0
2002-04-01	10.1
2003-04-01	10.2
2004-04-01	10.5
2005-01-01	10.5
2005-04-01	10.0
2005-07-01	9.8
2005-10-01	10.2
2006-01-01	10.1
2006-04-01	9.2
2006-07-01	9.1
2006-10-01	9.2
2007-01-01	9.0
2007-04-01	8.4
2007-07-01	8.2
2007-10-01	8.3
2008-01-01	8.3
2008-04-01	8.1
2008-07-01	8.0
2008-10-01	8.6
2009-01-01	9.6
2009-04-01	9.5
2009-07-01	9.7
2009-10-01	10.1
2010-01-01	10.6
2010-04-01	10.2
2010-07-01	10.1
2010-10-01	10.5
2011-01-01	10.7
2011-04-01	10
2011-07-01	10.3
2011-10-01	10.9
2012-01-01	11.6
2012-04-01	11.3
2012-07-01	11.4
2012-10-01	12.1
2013-01-01	12.6
2013-04-01	12.1
2013-07-01	11.8
2013-10-01	12.3
2014-01-01	12.4
2014-04-01	11.7
2014-07-01	11.6
2014-10-01	11.9
2015-01-01	11.8
2015-04-01	11.1
2015-07-01	10.7
2015-10-01	11.0
2016-01-01	11.0
2016-04-01	10.5
2016-07-01	10.2
2016-10-01	10.2
2017-01-01	10.3
2017-04-01	9.4
2017-07-01	9.3
2017-10-01	9.2
2018-01-01	9.4
2018-04-01	8.6