Quarter	Percent
1999-04-01	5.4
1999-07-01	5.2
1999-10-01	5.1
2000-01-01	5.2
2000-04-01	4.8
2000-07-01	4.5
2000-10-01	4.4
2001-01-01	4.4
2001-04-01	4.1
2001-07-01	4.1
2001-10-01	4.2
2002-01-01	4.4
2002-04-01	4.4
2002-07-01	4.3
2002-10-01	4.2
2003-01-01	4.2
2003-04-01	4.2
2003-07-01	4.1
2003-10-01	4.0
2004-01-01	3.9
2004-04-01	3.8
2004-07-01	3.5
2004-10-01	3.5
2005-01-01	3.6
2005-04-01	3.7
2005-07-01	3.5
2005-10-01	3.6
2006-01-01	4.1
2006-04-01	4.2
2006-07-01	4.0
2006-10-01	4.0
2007-01-01	4.1
2007-04-01	3.7
2007-07-01	3.6
2007-10-01	3.5
2008-01-01	4.0
2008-04-01	4.1
2008-07-01	4.4
2008-10-01	4.9
2009-01-01	5.9
2009-04-01	6.8
2009-07-01	6.8
2009-10-01	6.5
2010-01-01	7.2
2010-04-01	6.7
2010-07-01	6.3
2010-10-01	6.3
2011-01-01	6.4
2011-04-01	6.4
2011-07-01	6.4
2011-10-01	6.2
2012-01-01	6.1
2012-04-01	6.0
2012-07-01	5.9
2012-10-01	5.6
2013-01-01	6.3
2013-04-01	6.0
2013-07-01	5.6
2013-10-01	5.1
2014-01-01	5.0
2014-04-01	4.7
2014-07-01	4.4
2014-10-01	4.0
2015-01-01	4.0
2015-04-01	4.1
2015-07-01	3.9
2015-10-01	3.6
2016-01-01	3.7
2016-04-01	3.4
2016-07-01	3.4
2016-10-01	3.3
2017-01-01	3.4
2017-04-01	3.1
2017-07-01	2.8
2017-10-01	2.8
2018-01-01	3.0
2018-04-01	2.9