Quarter	Percent
2005-01-01	9.9
2005-04-01	8.8
2005-07-01	6.7
2005-10-01	7.6
2006-01-01	7.8
2006-04-01	5.5
2006-07-01	5.8
2006-10-01	5.1
2007-01-01	5.0
2007-04-01	4.1
2007-07-01	3.7
2007-10-01	4.2
2008-01-01	4.6
2008-04-01	5.2
2008-07-01	6.1
2008-10-01	8.4
2009-01-01	15.0
2009-04-01	17.1
2009-07-01	17.5
2009-10-01	19.9
2010-01-01	23.6
2010-04-01	22.5
2010-07-01	20.5
2010-10-01	19.5
2011-01-01	20.8
2011-04-01	19.0
2011-07-01	17.2
2011-10-01	15.7
2012-01-01	16.9
2012-04-01	15.9
2012-07-01	14.7
2012-10-01	14.5
2013-01-01	15.1
2013-04-01	13.7
2013-07-01	12.0
2013-10-01	12.6
2014-01-01	14.3
2014-04-01	13.4
2014-07-01	10.6
2014-10-01	11.4
2015-01-01	11.2
2015-04-01	11.0
2015-07-01	9.3
2015-10-01	9.6
2016-01-01	9.8
2016-04-01	9.7
2016-07-01	8.7
2016-10-01	9.0
2017-01-01	10.4
2017-04-01	8.9
2017-07-01	7.8
2017-10-01	7.9
2018-01-01	8.8
2018-04-01	6.7