Quarter	Percent
1999-04-01	8.3
1999-07-01	8.0
1999-10-01	8.0
2000-01-01	8.2
2000-04-01	8.1
2000-07-01	8.3
2000-10-01	8.3
2001-01-01	8.4
2001-04-01	8.7
2001-07-01	8.9
2001-10-01	8.8
2002-01-01	9.0
2002-04-01	8.8
2002-07-01	8.6
2002-10-01	8.4
2003-01-01	8.8
2003-04-01	8.6
2003-07-01	8.6
2003-10-01	8.9
2004-01-01	8.9
2004-04-01	9.1
2004-07-01	9.2
2004-10-01	8.9
2005-01-01	8.9
2005-04-01	9.1
2005-07-01	8.9
2005-10-01	8.8
2006-01-01	8.4
2006-04-01	8.3
2006-07-01	8.3
2006-10-01	8.3
2007-01-01	8.4
2007-04-01	8.3
2007-07-01	8.3
2007-10-01	8.6
2008-01-01	8.3
2008-04-01	8.3
2008-07-01	8.6
2008-10-01	8.2
2009-01-01	7.9
2009-04-01	8.5
2009-07-01	8.5
2009-10-01	8.6
2010-01-01	8.9
2010-04-01	8.6
2010-07-01	8.4
2010-10-01	8.4
2011-01-01	8.3
2011-04-01	8.4
2011-07-01	8.4
2011-10-01	8.3
2012-01-01	8.2
2012-04-01	8.0
2012-07-01	7.9
2012-10-01	7.9
2013-01-01	8.0
2013-04-01	8.0
2013-07-01	7.9
2013-10-01	8.0
2014-01-01	7.8
2014-04-01	7.6
2014-07-01	7.6
2014-10-01	8.1
2015-01-01	8.0
2015-04-01	8.2
2015-07-01	8.2
2015-10-01	7.9
2016-01-01	7.8
2016-04-01	7.7
2016-07-01	7.8
2016-10-01	8.0
2017-01-01	7.9
2017-04-01	7.6
2017-07-01	7.6
2017-10-01	7.5
2018-01-01	7.6
2018-04-01	7.6