Quarter	Percent
1998-04-01	13.5
1998-10-01	13.6
1999-04-01	13.4
1999-10-01	13.2
2000-04-01	13.4
2000-10-01	13.1
2001-04-01	12.5
2001-10-01	12.6
2002-01-01	12.6
2002-04-01	12.8
2002-07-01	10.8
2002-10-01	10.7
2003-01-01	11.9
2003-04-01	12.0
2003-07-01	11.3
2003-10-01	11.5
2004-01-01	12.3
2004-04-01	12.3
2004-07-01	11.1
2004-10-01	12.3
2005-01-01	12.3
2005-04-01	9.9
2005-07-01	9.3
2005-10-01	8.4
2006-01-01	8.7
2006-04-01	6.4
2006-07-01	5.5
2006-10-01	6.3
2007-01-01	6.0
2007-04-01	6.0
2007-07-01	5.3
2007-10-01	4.9
2008-01-01	6.1
2008-04-01	6.6
2008-07-01	6.9
2008-10-01	8.7
2009-01-01	11.1
2009-04-01	13.7
2009-07-01	15.5
2009-10-01	16.4
2010-01-01	15.8
2010-04-01	17.1
2010-07-01	16.2
2010-10-01	16.1
2011-01-01	15.1
2011-04-01	14.1
2011-07-01	13.1
2011-10-01	12.9
2012-01-01	15.1
2012-04-01	15.2
2012-07-01	13.3
2012-10-01	12.3
2013-01-01	11.4
2013-04-01	10.8
2013-07-01	11.6
2013-10-01	10.8
2014-01-01	10.0
2014-04-01	9.1
2014-07-01	10.1
2014-10-01	10.1
2015-01-01	9.5
2015-04-01	8.1
2015-07-01	8.3
2015-10-01	8.7
2016-01-01	9.5
2016-04-01	8.4
2016-07-01	7.9
2016-10-01	7.8
2017-01-01	8.2
2017-04-01	7.4
2017-07-01	7.9
2017-10-01	7.3
2018-01-01	7.4
2018-04-01	6.1