Quarter	Percent
2005-01-01	10.0
2005-04-01	9.0
2005-07-01	7.4
2005-10-01	7.3
2006-01-01	6.8
2006-04-01	5.6
2006-07-01	5.8
2006-10-01	5.1
2007-01-01	5.2
2007-04-01	4.2
2007-07-01	3.9
2007-10-01	4.0
2008-01-01	5.0
2008-04-01	4.6
2008-07-01	6.0
2008-10-01	7.9
2009-01-01	12.3
2009-04-01	14.0
2009-07-01	14.0
2009-10-01	15.8
2010-01-01	18.5
2010-04-01	18.5
2010-07-01	17.9
2010-10-01	17.4
2011-01-01	17.4
2011-04-01	15.9
2011-07-01	15.2
2011-10-01	14.1
2012-01-01	14.8
2012-04-01	13.6
2012-07-01	12.8
2012-10-01	13.4
2013-01-01	13.3
2013-04-01	11.9
2013-07-01	11.1
2013-10-01	11.6
2014-01-01	12.6
2014-04-01	11.4
2014-07-01	9.3
2014-10-01	10.2
2015-01-01	10.1
2015-04-01	9.6
2015-07-01	8.5
2015-10-01	9.0
2016-01-01	8.5
2016-04-01	8.2
2016-07-01	7.7
2016-10-01	7.8
2017-01-01	8.3
2017-04-01	7.2
2017-07-01	6.8
2017-10-01	6.9
2018-01-01	7.4
2018-04-01	6.1