Quarter	Percent
1999-04-01	9.3
2000-04-01	8.4
2001-04-01	7.7
2002-04-01	8.9
2003-01-01	12.1
2003-04-01	8.4
2003-07-01	9.0
2003-10-01	12
2004-01-01	14.2
2004-04-01	8.7
2004-07-01	10.3
2004-10-01	12.7
2005-01-01	14
2005-04-01	9.0
2005-07-01	8.7
2005-10-01	11.2
2006-01-01	12.6
2006-04-01	7.3
2006-07-01	8.6
2006-10-01	9.5
2007-01-01	10.3
2007-04-01	7.5
2007-07-01	8.2
2007-10-01	9.4
2008-01-01	11
2008-04-01	7.3
2008-07-01	9.1
2008-10-01	11.5
2009-01-01	13.8
2009-04-01	10
2009-07-01	11.3
2009-10-01	13.9
2010-01-01	13.4
2010-04-01	10.2
2010-07-01	13.1
2010-10-01	13.1
2011-01-01	14.1
2011-04-01	10.9
2011-07-01	12.7
2011-10-01	13.3
2012-01-01	14.5
2012-04-01	10.8
2012-07-01	11.9
2012-10-01	14.5
2013-01-01	15
2013-04-01	9.5
2013-07-01	9.8
2013-10-01	12.8
2014-01-01	11.9
2014-04-01	7.5
2014-07-01	9.3
2014-10-01	11.3
2015-01-01	11.0
2015-04-01	7.2
2015-07-01	7.3
2015-10-01	11.1
2016-01-01	9.2
2016-04-01	6.5
2016-07-01	6.3
2016-10-01	8.9
2017-01-01	9.0
2017-04-01	5.9
2017-07-01	9.2
2017-10-01	10.7
2018-01-01	10.9
2018-04-01	8.5