Quarter	Percent
1998-04-01	12.6
1998-10-01	13.5
1999-04-01	14.0
1999-10-01	14.0
2000-04-01	14.5
2000-10-01	14.5
2001-04-01	14.0
2001-10-01	13.9
2002-01-01	16.3
2002-04-01	13.3
2002-07-01	14.9
2002-10-01	13.6
2003-01-01	13.9
2003-04-01	13.9
2003-07-01	12.7
2003-10-01	15.2
2004-01-01	14.7
2004-04-01	14.3
2004-07-01	13.6
2004-10-01	14.4
2005-01-01	14.8
2005-04-01	14.2
2005-07-01	15.2
2005-10-01	15.0
2006-01-01	15.4
2006-04-01	13.6
2006-07-01	13.5
2006-10-01	13.3
2007-01-01	14.8
2007-04-01	13.7
2007-07-01	11.7
2007-10-01	11.5
2008-01-01	12.3
2008-04-01	11.7
2008-07-01	11.3
2008-10-01	9.9
2009-01-01	10.9
2009-04-01	12.0
2009-07-01	11.8
2009-10-01	11.6
2010-01-01	12.3
2010-04-01	12.0
2010-07-01	11.0
2010-10-01	10.4
2011-01-01	12.2
2011-04-01	11.9
2011-07-01	11.8
2011-10-01	12.0
2012-01-01	12.5
2012-04-01	11.7
2012-07-01	11.4
2012-10-01	10.9
2013-01-01	11.7
2013-04-01	13.3
2013-07-01	11.8
2013-10-01	12.7
2014-01-01	12.1
2014-04-01	12.4
2014-07-01	13.1
2014-10-01	13.8
2015-01-01	13.4
2015-04-01	12.0
2015-07-01	11.5
2015-10-01	12.8
2016-01-01	12.2
2016-04-01	12.4
2016-07-01	11.7
2016-10-01	12.2
2017-01-01	11.7
2017-04-01	12.5
2017-07-01	11.0
2017-10-01	10.6
2018-01-01	10.9
2018-04-01	11.0