Quarter	Percent
1999-01-01	8.8
2000-01-01	7.4
2001-01-01	6.0
2002-01-01	6.7
2003-01-01	6.7
2003-04-01	6.1
2003-07-01	5.7
2003-10-01	6.8
2004-01-01	7.0
2004-04-01	6.3
2004-07-01	6.0
2004-10-01	7.0
2005-01-01	7.0
2005-04-01	6.5
2005-07-01	6.1
2005-10-01	6.8
2006-01-01	7.2
2006-04-01	6.5
2006-07-01	6.0
2006-10-01	6.4
2007-01-01	6.8
2007-04-01	6.1
2007-07-01	5.8
2007-10-01	5.9
2008-01-01	6.0
2008-04-01	5.2
2008-07-01	5.0
2008-10-01	5.6
2009-01-01	6.9
2009-04-01	6.8
2009-07-01	6.5
2009-10-01	7.8
2010-01-01	8.0
2010-04-01	7.3
2010-07-01	6.6
2010-10-01	7.3
2011-01-01	7.6
2011-04-01	7.0
2011-07-01	6.8
2011-10-01	8.0
2012-01-01	8.7
2012-04-01	7.8
2012-07-01	7.4
2012-10-01	8.6
2013-01-01	9.4
2013-04-01	8.7
2013-07-01	8.2
2013-10-01	8.8
2014-01-01	9.9
2014-04-01	8.8
2014-07-01	8.5
2014-10-01	9.5
2015-01-01	10.1
2015-04-01	9.6
2015-07-01	8.9
2015-10-01	9.4
2016-01-01	9.9
2016-04-01	8.7
2016-07-01	7.9
2016-10-01	8.9
2017-01-01	8.7
2017-04-01	8.1
2017-07-01	7.9
2017-10-01	7.9
2018-01-01	8.4
2018-04-01	7.6