Quarter	Percent
2005-01-01	9.8
2005-04-01	8.7
2005-07-01	6.6
2005-10-01	7.4
2006-01-01	7.6
2006-04-01	5.4
2006-07-01	5.8
2006-10-01	5.0
2007-01-01	4.9
2007-04-01	4.1
2007-07-01	3.7
2007-10-01	4.1
2008-01-01	4.6
2008-04-01	5.2
2008-07-01	6.0
2008-10-01	8.3
2009-01-01	14.8
2009-04-01	16.9
2009-07-01	17.2
2009-10-01	19.5
2010-01-01	23.3
2010-04-01	22.2
2010-07-01	20.2
2010-10-01	19.2
2011-01-01	20.5
2011-04-01	18.7
2011-07-01	17.0
2011-10-01	15.5
2012-01-01	16.6
2012-04-01	15.5
2012-07-01	14.4
2012-10-01	14.3
2013-01-01	14.9
2013-04-01	13.4
2013-07-01	11.8
2013-10-01	12.4
2014-01-01	14.0
2014-04-01	13.2
2014-07-01	10.5
2014-10-01	11.2
2015-01-01	11.1
2015-04-01	10.8
2015-07-01	9.1
2015-10-01	9.5
2016-01-01	9.7
2016-04-01	9.5
2016-07-01	8.5
2016-10-01	8.8
2017-01-01	10.1
2017-04-01	8.6
2017-07-01	7.7
2017-10-01	7.8
2018-01-01	8.7
2018-04-01	6.5