Quarter	Percent
2006-01-01	5.0
2006-04-01	3.0
2006-07-01	2.8
2006-10-01	3.7
2007-01-01	4.1
2007-04-01	3.2
2007-07-01	2.9
2007-10-01	3.9
2008-01-01	4.4
2008-04-01	3.9
2008-07-01	4.1
2008-10-01	5.1
2009-01-01	6.2
2009-04-01	5.8
2009-07-01	5.3
2009-10-01	5.4
2010-01-01	6.2
2010-04-01	4.7
2010-07-01	4.4
2010-10-01	4.8
2011-01-01	5.6
2011-04-01	4.8
2011-07-01	3.5
2011-10-01	3.5
2012-01-01	4.9
2012-04-01	3.9
2012-07-01	2.7
2012-10-01	4.1
2013-01-01	4.6
2013-04-01	4.3
2013-07-01	4.8
2013-10-01	4.9
2014-01-01	6.4
2014-04-01	5.8
2014-07-01	5.3
2014-10-01	6.5
2015-01-01	6.8
2015-04-01	6.1
2015-07-01	6.5
2015-10-01	7.3
2016-01-01	6.8
2016-04-01	5.4
2016-07-01	6.0
2016-10-01	6.5
2017-01-01	7.8
2017-04-01	6.5
2017-07-01	5.6
2017-10-01	6.2
2018-01-01	7.8
2018-04-01	6.1