Quarter	Percent
2005-01-01	9.6
2005-04-01	6.6
2005-07-01	5.7
2005-10-01	5.9
2006-01-01	6.3
2006-04-01	6.6
2006-07-01	5.8
2006-10-01	5.7
2007-01-01	4.6
2007-04-01	3.3
2007-07-01	3.1
2007-10-01	4.0
2008-01-01	4.3
2008-07-01	4.0
2008-10-01	7.0
2009-01-01	8.8
2009-04-01	10.3
2009-07-01	11.8
2009-10-01	11.3
2010-01-01	14.7
2010-04-01	16.8
2010-07-01	14.0
2010-10-01	12.0
2011-01-01	13.7
2011-04-01	14.0
2011-07-01	12.7
2011-10-01	13.1
2012-01-01	12.7
2012-04-01	11.4
2012-07-01	11.5
2012-10-01	12.1
2013-01-01	11.7
2013-04-01	11.3
2013-07-01	10.0
2013-10-01	11.9
2014-01-01	12.3
2014-04-01	10.2
2014-07-01	9.1
2014-10-01	11.2
2015-01-01	8.8
2015-04-01	9.4
2015-07-01	7.7
2015-10-01	9.1
2016-01-01	8.4
2016-04-01	7.9
2016-07-01	7.6
2016-10-01	7.0
2017-01-01	7.5
2017-04-01	7.1
2017-07-01	7.2
2017-10-01	7.3
2018-01-01	7.4
2018-04-01	7.9