Quarter	Percent
1998-04-01	7.6
1999-04-01	5.8
2000-04-01	4.1
2001-04-01	5.5
2002-04-01	3.9
2003-04-01	8.7
2004-04-01	7.4
2005-04-01	9.1
2006-04-01	7.5
2007-04-01	7.4
2008-04-01	7.4
2009-04-01	9.0
2010-01-01	10.6
2010-04-01	7.8
2010-07-01	9.9
2010-10-01	6.3
2011-01-01	8.1
2011-04-01	5.1
2011-07-01	9.6
2011-10-01	8.7
2012-01-01	8.0
2012-04-01	6.3
2012-07-01	9.1
2012-10-01	8.6
2013-01-01	8.1
2013-04-01	8.4
2013-07-01	10.7
2013-10-01	7.8
2014-01-01	8.4
2014-04-01	7.6
2014-07-01	12.1
2014-10-01	6.3
2015-01-01	6.4
2015-04-01	6.0
2015-07-01	10.8
2015-10-01	10.3
2016-01-01	6.4
2016-04-01	7.1
2016-07-01	11.6
2016-10-01	8.4
2017-01-01	7.0
2017-04-01	7.2
2017-07-01	10.5
2017-10-01	7.3
2018-01-01	8.8
2018-04-01	6.0