Quarter	Percent
2006-01-01	10.6
2006-04-01	7.5
2006-07-01	9.7
2006-10-01	9.8
2007-01-01	9.9
2007-04-01	8.2
2007-07-01	9.6
2007-10-01	9.9
2008-01-01	10.7
2008-04-01	8.4
2008-07-01	10.3
2008-10-01	11.6
2009-01-01	14.1
2009-04-01	12.4
2009-07-01	13.2
2009-10-01	12.1
2010-01-01	13.2
2010-04-01	10.6
2010-07-01	11.7
2010-10-01	11.2
2011-01-01	11.3
2011-04-01	9.9
2011-07-01	10.5
2011-10-01	9.6
2012-01-01	10.1
2012-04-01	8.3
2012-07-01	9.8
2012-10-01	10.3
2013-01-01	10.9
2013-04-01	9.7
2013-07-01	11.3
2013-10-01	11.3
2014-01-01	11.6
2014-04-01	10.7
2014-07-01	12.8
2014-10-01	13.2
2015-01-01	13.4
2015-04-01	11.7
2015-07-01	13.3
2015-10-01	13.1
2016-01-01	12.9
2016-04-01	11.3
2016-07-01	15.3
2016-10-01	16.1
2017-01-01	14.9
2017-04-01	13.1
2017-07-01	15.1
2017-10-01	13.6
2018-01-01	13.5
2018-04-01	12.5