Quarter	Percent
2005-01-01	9.9
2005-04-01	8.9
2005-07-01	7.3
2005-10-01	7.2
2006-01-01	6.7
2006-04-01	5.6
2006-07-01	5.8
2006-10-01	5.1
2007-01-01	5.1
2007-04-01	4.1
2007-07-01	3.8
2007-10-01	4.0
2008-01-01	5.0
2008-04-01	4.6
2008-07-01	5.9
2008-10-01	7.8
2009-01-01	12.1
2009-04-01	13.8
2009-07-01	13.8
2009-10-01	15.5
2010-01-01	18.2
2010-04-01	18.2
2010-07-01	17.7
2010-10-01	17.2
2011-01-01	17.2
2011-04-01	15.6
2011-07-01	15.0
2011-10-01	13.9
2012-01-01	14.6
2012-04-01	13.3
2012-07-01	12.5
2012-10-01	13.2
2013-01-01	13.1
2013-04-01	11.7
2013-07-01	10.9
2013-10-01	11.4
2014-01-01	12.4
2014-04-01	11.2
2014-07-01	9.1
2014-10-01	10.1
2015-01-01	10.0
2015-04-01	9.4
2015-07-01	8.3
2015-10-01	8.8
2016-01-01	8.4
2016-04-01	8.0
2016-07-01	7.5
2016-10-01	7.7
2017-01-01	8.1
2017-04-01	7.0
2017-07-01	6.6
2017-10-01	6.7
2018-01-01	7.2
2018-04-01	5.9