Quarter	Percent
2000-04-01	30.3
2001-04-01	30.5
2002-04-01	30.7
2003-04-01	30.6
2004-04-01	30.6
2005-01-01	30.6
2005-04-01	30.3
2005-07-01	30
2005-10-01	30.2
2006-01-01	30.5
2006-04-01	30
2006-07-01	29.6
2006-10-01	29.9
2007-01-01	30.4
2007-04-01	30.0
2007-07-01	29.5
2007-10-01	30.0
2008-01-01	30.1
2008-04-01	29.7
2008-07-01	29.4
2008-10-01	29.7
2009-01-01	30.1
2009-04-01	30.0
2009-07-01	29.7
2009-10-01	30.1
2010-01-01	30.3
2010-04-01	29.9
2010-07-01	29.8
2010-10-01	30.1
2011-01-01	30.5
2011-04-01	30.2
2011-07-01	30.0
2011-10-01	30.1
2012-01-01	30.4
2012-04-01	29.9
2012-07-01	29.6
2012-10-01	29.8
2013-01-01	30.3
2013-04-01	30.0
2013-07-01	29.7
2013-10-01	30.0
2014-01-01	30.3
2014-04-01	30.1
2014-07-01	29.7
2014-10-01	29.9
2015-01-01	30.3
2015-04-01	30.1
2015-07-01	29.7
2015-10-01	29.8
2016-01-01	30.1
2016-04-01	29.8
2016-07-01	29.5
2016-10-01	29.7
2017-01-01	30.1
2017-04-01	29.5
2017-07-01	29.2
2017-10-01	29.5
2018-01-01	29.8
2018-04-01	29.4