Quarter	Percent
2005-01-01	9.1
2005-04-01	8.6
2005-07-01	7.2
2005-10-01	6.8
2006-01-01	6.4
2006-04-01	5.0
2006-07-01	5.3
2006-10-01	4.7
2007-01-01	4.8
2007-04-01	4.0
2007-07-01	3.5
2007-10-01	3.6
2008-01-01	4.6
2008-04-01	4.1
2008-07-01	5.1
2008-10-01	6.9
2009-01-01	11.2
2009-04-01	12.6
2009-07-01	12.1
2009-10-01	14.9
2010-01-01	17.1
2010-04-01	16.8
2010-07-01	16.5
2010-10-01	16.4
2011-01-01	16.3
2011-04-01	14.4
2011-07-01	13.8
2011-10-01	12.6
2012-01-01	13.8
2012-04-01	12.8
2012-07-01	11.3
2012-10-01	12.3
2013-01-01	12.6
2013-04-01	11.1
2013-07-01	9.8
2013-10-01	10.5
2014-01-01	11.7
2014-04-01	10.5
2014-07-01	8.4
2014-10-01	9.0
2015-01-01	9.3
2015-04-01	8.8
2015-07-01	7.9
2015-10-01	8.5
2016-01-01	7.9
2016-04-01	7.5
2016-07-01	7.0
2016-10-01	7.2
2017-01-01	7.8
2017-04-01	6.6
2017-07-01	6.0
2017-10-01	6.1
2018-01-01	6.6
2018-04-01	5.0