Quarter	Percent
2006-01-01	9.1
2006-04-01	6.7
2006-07-01	7.0
2006-10-01	7.0
2007-01-01	8.5
2007-04-01	6.8
2007-07-01	6.7
2007-10-01	7.7
2008-01-01	9.1
2008-04-01	7.1
2008-07-01	7.5
2008-10-01	9.4
2009-01-01	12.7
2009-04-01	10.7
2009-07-01	10.7
2009-10-01	10.2
2010-01-01	11.6
2010-04-01	8.8
2010-07-01	8.7
2010-10-01	8.4
2011-01-01	9.3
2011-04-01	7.4
2011-07-01	6.9
2011-10-01	7.2
2012-01-01	8.5
2012-04-01	6.4
2012-07-01	6.8
2012-10-01	7.1
2013-01-01	8.2
2013-04-01	7.1
2013-07-01	7.5
2013-10-01	7.7
2014-01-01	9.3
2014-04-01	7.7
2014-07-01	8.7
2014-10-01	9.3
2015-01-01	10.0
2015-04-01	8.2
2015-07-01	8.7
2015-10-01	9.1
2016-01-01	9.9
2016-04-01	8.3
2016-07-01	10.0
2016-10-01	10.6
2017-01-01	11.2
2017-04-01	8.7
2017-07-01	8.9
2017-10-01	9.0
2018-01-01	9.5
2018-04-01	8.6