Quarter	Percent
2005-01-01	9.4
2005-04-01	9.2
2005-07-01	8.2
2005-10-01	6.9
2006-01-01	5.4
2006-04-01	5.3
2006-07-01	5.9
2006-10-01	4.9
2007-01-01	5.0
2007-04-01	4.1
2007-07-01	3.6
2007-10-01	3.4
2008-01-01	4.7
2008-04-01	3.5
2008-07-01	5.2
2008-10-01	6.5
2009-01-01	9.0
2009-04-01	10.0
2009-07-01	9.1
2009-10-01	11.2
2010-01-01	12.6
2010-04-01	13.1
2010-07-01	14.1
2010-10-01	14.3
2011-01-01	13.5
2011-04-01	11.8
2011-07-01	11.8
2011-10-01	11.3
2012-01-01	12.2
2012-04-01	10.8
2012-07-01	9.6
2012-10-01	11.5
2013-01-01	11.1
2013-04-01	9.5
2013-07-01	9.4
2013-10-01	10.3
2014-01-01	10.4
2014-04-01	8.9
2014-07-01	7.5
2014-10-01	8.3
2015-01-01	8.7
2015-04-01	7.5
2015-07-01	7.2
2015-10-01	7.7
2016-01-01	6.7
2016-04-01	6.2
2016-07-01	6.1
2016-10-01	6.4
2017-01-01	5.7
2017-04-01	4.9
2017-07-01	4.8
2017-10-01	5.1
2018-01-01	5.0
2018-04-01	4.3