Quarter	Percent
1998-04-01	65.5
1999-04-01	65.7
2000-04-01	65.6
2001-04-01	66.1
2002-04-01	65.7
2003-04-01	65.1
2004-04-01	64.4
2005-04-01	64
2006-04-01	64.7
2007-04-01	65.2
2008-04-01	65.9
2009-04-01	65.4
2010-01-01	63.2
2010-04-01	63.9
2010-07-01	64.0
2010-10-01	64.0
2011-01-01	64.1
2011-04-01	64.6
2011-07-01	64.4
2011-10-01	64.8
2012-01-01	64.2
2012-04-01	64.5
2012-07-01	64.8
2012-10-01	64.5
2013-01-01	64.0
2013-04-01	64.3
2013-07-01	64.3
2013-10-01	64.7
2014-01-01	63.9
2014-04-01	64.6
2014-07-01	64.5
2014-10-01	65.6
2015-01-01	64.9
2015-04-01	64.9
2015-07-01	64.5
2015-10-01	65.2
2016-01-01	65.0
2016-04-01	65.1
2016-07-01	65.1
2016-10-01	65.6
2017-01-01	64.8
2017-04-01	65.3
2017-07-01	65.2
2017-10-01	65.4
2018-01-01	64.8
2018-04-01	65.3