Quarter	Percent
2005-01-01	8.9
2005-04-01	8.0
2005-07-01	6.2
2005-10-01	6.7
2006-01-01	7.4
2006-04-01	4.8
2006-07-01	4.8
2006-10-01	4.5
2007-01-01	4.5
2007-04-01	3.9
2007-07-01	3.4
2007-10-01	3.9
2008-01-01	4.4
2008-04-01	4.7
2008-07-01	5.0
2008-10-01	7.3
2009-01-01	13.6
2009-04-01	15.3
2009-07-01	15.3
2009-10-01	18.8
2010-01-01	21.7
2010-04-01	20.7
2010-07-01	19.1
2010-10-01	18.7
2011-01-01	19.2
2011-04-01	17.0
2011-07-01	16.0
2011-10-01	13.8
2012-01-01	15.5
2012-04-01	14.8
2012-07-01	13.1
2012-10-01	13.0
2013-01-01	14.2
2013-04-01	12.7
2013-07-01	10.2
2013-10-01	10.6
2014-01-01	13.1
2014-04-01	12.2
2014-07-01	9.3
2014-10-01	9.8
2015-01-01	10.0
2015-04-01	10.1
2015-07-01	8.6
2015-10-01	9.2
2016-01-01	9.1
2016-04-01	8.7
2016-07-01	7.9
2016-10-01	8.0
2017-01-01	9.9
2017-04-01	8.3
2017-07-01	7.3
2017-10-01	7.1
2018-01-01	8.2
2018-04-01	5.8