Quarter	Percent
1998-04-01	14.7
1998-10-01	13.7
1999-04-01	14.0
1999-10-01	14.5
2000-04-01	14.5
2000-10-01	14.5
2001-04-01	14.1
2001-10-01	13.8
2002-01-01	13.3
2002-04-01	14.0
2002-07-01	11.0
2002-10-01	12.1
2003-01-01	11.9
2003-04-01	12.2
2003-07-01	12.1
2003-10-01	11.0
2004-01-01	12.6
2004-04-01	11.9
2004-07-01	11.4
2004-10-01	11.9
2005-01-01	11.8
2005-04-01	10.4
2005-07-01	9.6
2005-10-01	8.8
2006-01-01	8.7
2006-04-01	7.4
2006-07-01	6.2
2006-10-01	6.5
2007-01-01	7.3
2007-04-01	6.5
2007-07-01	5.7
2007-10-01	5.3
2008-01-01	7.0
2008-04-01	6.9
2008-07-01	7.7
2008-10-01	10.6
2009-01-01	14.7
2009-04-01	17.9
2009-07-01	19.0
2009-10-01	20.3
2010-01-01	21.5
2010-04-01	20.8
2010-07-01	18.8
2010-10-01	18.1
2011-01-01	18.0
2011-04-01	17.5
2011-07-01	15.3
2011-10-01	15.3
2012-01-01	16.7
2012-04-01	16.6
2012-07-01	14.0
2012-10-01	14.2
2013-01-01	13.3
2013-04-01	11.6
2013-07-01	12.0
2013-10-01	11.5
2014-01-01	12.1
2014-04-01	10.8
2014-07-01	10.9
2014-10-01	10.5
2015-01-01	10.4
2015-04-01	9.9
2015-07-01	10.0
2015-10-01	10.0
2016-01-01	10.5
2016-04-01	9.7
2016-07-01	9.8
2016-10-01	9.6
2017-01-01	9.7
2017-04-01	9.0
2017-07-01	8.7
2017-10-01	8.3
2018-01-01	8.4
2018-04-01	7.9