Quarter	Percent
1999-04-01	4.9
1999-07-01	4.6
1999-10-01	4.6
2000-01-01	4.1
2000-04-01	3.7
2000-07-01	3.2
2000-10-01	3.2
2001-01-01	3.3
2001-04-01	3.1
2001-07-01	3.1
2001-10-01	3.0
2002-01-01	3.3
2002-04-01	3.2
2002-07-01	3.3
2002-10-01	3.5
2003-01-01	3.5
2003-04-01	3.5
2003-07-01	3.7
2003-10-01	3.4
2004-01-01	3.3
2004-04-01	3.2
2004-07-01	2.9
2004-10-01	3.3
2005-01-01	3.0
2005-04-01	3.1
2005-07-01	3.2
2005-10-01	3.6
2006-01-01	3.6
2006-04-01	3.6
2006-07-01	3.6
2006-10-01	3.5
2007-01-01	4.5
2007-04-01	4.4
2007-07-01	4.6
2007-10-01	4.0
2008-01-01	4.2
2008-04-01	4.3
2008-07-01	5.4
2008-10-01	5.6
2009-01-01	7.3
2009-04-01	8.0
2009-07-01	9.5
2009-10-01	8.8
2010-01-01	9.0
2010-04-01	10.3
2010-07-01	10.8
2010-10-01	10.7
2011-01-01	11.2
2011-04-01	11.2
2011-07-01	12.5
2011-10-01	11.5
2012-01-01	12.4
2012-04-01	11.5
2012-07-01	12.1
2012-10-01	11.1
2013-01-01	11.7
2013-04-01	11.7
2013-07-01	11.2
2013-10-01	10.5
2014-01-01	10.6
2014-04-01	9.8
2014-07-01	10.6
2014-10-01	8.8
2015-01-01	8.9
2015-04-01	8.6
2015-07-01	8.3
2015-10-01	7.2
2016-01-01	7.3
2016-04-01	7.5
2016-07-01	7.3
2016-10-01	6.2
2017-01-01	6.2
2017-04-01	5.0
2017-07-01	5.5
2017-10-01	5.0
2018-01-01	4.9
2018-04-01	4.8