Quarter	Percent
1998-04-01	6.1
1999-04-01	6.2
2000-04-01	5.0
2001-04-01	5.6
2002-04-01	5.6
2003-04-01	8.5
2004-04-01	7.7
2005-04-01	8.8
2006-04-01	7.7
2007-04-01	7.1
2008-04-01	7.0
2009-04-01	8.5
2010-01-01	9.5
2010-04-01	7.5
2010-07-01	9.4
2010-10-01	6.4
2011-01-01	8.0
2011-04-01	6.0
2011-07-01	9.2
2011-10-01	7.6
2012-01-01	8.0
2012-04-01	6.2
2012-07-01	9.9
2012-10-01	9.1
2013-01-01	8.9
2013-04-01	7.5
2013-07-01	10.2
2013-10-01	8.3
2014-01-01	9.6
2014-04-01	7.8
2014-07-01	10.8
2014-10-01	6.1
2015-01-01	7.4
2015-04-01	6.9
2015-07-01	10.8
2015-10-01	10.0
2016-01-01	8.4
2016-04-01	6.9
2016-07-01	11.2
2016-10-01	7.8
2017-01-01	7.9
2017-04-01	6.9
2017-07-01	10.5
2017-10-01	6.9
2018-01-01	8.8
2018-04-01	6.4