Quarter	Percent
2005-01-01	10.0
2005-04-01	9.1
2005-07-01	8.1
2005-10-01	6.9
2006-01-01	5.8
2006-04-01	5.7
2006-07-01	5.7
2006-10-01	5.2
2007-01-01	5.4
2007-04-01	4.1
2007-07-01	4.0
2007-10-01	3.8
2008-01-01	5.4
2008-04-01	3.9
2008-07-01	5.8
2008-10-01	7.4
2009-01-01	9.5
2009-04-01	10.7
2009-07-01	10.3
2009-10-01	11.6
2010-01-01	13.3
2010-04-01	14.3
2010-07-01	15.2
2010-10-01	15.3
2011-01-01	13.9
2011-04-01	12.6
2011-07-01	13.0
2011-10-01	12.3
2012-01-01	12.5
2012-04-01	11.1
2012-07-01	10.7
2012-10-01	12.0
2013-01-01	11.4
2013-04-01	10.1
2013-07-01	10.0
2013-10-01	10.5
2014-01-01	10.9
2014-04-01	9.3
2014-07-01	7.8
2014-10-01	8.9
2015-01-01	8.9
2015-04-01	8.0
2015-07-01	7.6
2015-10-01	8.2
2016-01-01	7.1
2016-04-01	6.6
2016-07-01	6.5
2016-10-01	6.5
2017-01-01	6.1
2017-04-01	5.4
2017-07-01	5.6
2017-10-01	5.7
2018-01-01	5.7
2018-04-01	5.3