Quarter	Percent
1999-04-01	7.4
2000-01-01	6.1
2000-04-01	5.3
2000-07-01	6.3
2000-10-01	5.4
2001-01-01	5.1
2001-04-01	4.4
2001-07-01	4.2
2001-10-01	4.7
2002-01-01	5.0
2002-04-01	4.6
2002-07-01	5.1
2002-10-01	5.3
2003-01-01	6.2
2003-04-01	6.6
2003-07-01	6.0
2003-10-01	6.4
2004-01-01	8.5
2004-04-01	8.0
2004-07-01	7.2
2004-10-01	8.1
2005-01-01	9.3
2005-04-01	8.6
2005-07-01	7.7
2005-10-01	7.3
2006-01-01	7.7
2006-04-01	6.0
2006-07-01	6.3
2006-10-01	6.2
2007-01-01	7.1
2007-04-01	6.1
2007-07-01	5.5
2007-10-01	5.2
2008-01-01	5.7
2008-04-01	5.6
2008-07-01	4.9
2008-10-01	5.0
2009-01-01	6.5
2009-04-01	6.3
2009-07-01	6.6
2009-10-01	7.0
2010-01-01	9.6
2010-04-01	8.9
2010-07-01	8.3
2010-10-01	8.1
2011-01-01	10.7
2011-04-01	9.3
2011-07-01	9.6
2011-10-01	10.4
2012-01-01	12.2
2012-04-01	11.4
2012-07-01	11.4
2012-10-01	11.9
2013-01-01	13.3
2013-04-01	12.7
2013-07-01	13.3
2013-10-01	13.5
2014-01-01	14.4
2014-04-01	12.9
2014-07-01	12.0
2014-10-01	11.7
2015-01-01	11.9
2015-04-01	11.0
2015-07-01	11.0
2015-10-01	11.1
2016-01-01	12.0
2016-04-01	10.9
2016-07-01	10.3
2016-10-01	10.1
2017-01-01	10.3
2017-04-01	9.0
2017-07-01	8.4
2017-10-01	7.7
2018-01-01	7.8
2018-04-01	6.9