Quarter	Percent
1998-04-01	4.7
1999-04-01	6.5
2000-04-01	5.8
2001-04-01	5.8
2002-04-01	7.1
2003-04-01	8.3
2004-04-01	8.0
2005-04-01	8.5
2006-04-01	7.9
2007-04-01	6.9
2008-04-01	6.7
2009-04-01	8.0
2010-01-01	8.5
2010-04-01	7.3
2010-07-01	8.9
2010-10-01	6.4
2011-01-01	7.8
2011-04-01	6.9
2011-07-01	8.7
2011-10-01	6.6
2012-01-01	8.0
2012-04-01	6.1
2012-07-01	10.7
2012-10-01	9.6
2013-01-01	9.6
2013-04-01	6.6
2013-07-01	9.7
2013-10-01	8.9
2014-01-01	10.8
2014-04-01	8.0
2014-07-01	9.7
2014-10-01	6.0
2015-01-01	8.3
2015-04-01	7.8
2015-07-01	10.9
2015-10-01	9.8
2016-01-01	10.4
2016-04-01	6.7
2016-07-01	10.7
2016-10-01	7.1
2017-01-01	8.9
2017-04-01	6.6
2017-07-01	10.4
2017-10-01	6.6
2018-01-01	8.8
2018-04-01	6.7