Quarter	Percent
2000-04-01	86.7
2001-04-01	86.9
2002-04-01	86.5
2003-04-01	86.2
2004-04-01	85.9
2005-01-01	85.6
2005-04-01	86.3
2005-07-01	86.6
2005-10-01	86.4
2006-01-01	86.2
2006-04-01	87.0
2006-07-01	87.4
2006-10-01	87.2
2007-01-01	86.9
2007-04-01	87.8
2007-07-01	88
2007-10-01	87.8
2008-01-01	87.2
2008-04-01	87.7
2008-07-01	87.7
2008-10-01	86.9
2009-01-01	85.0
2009-04-01	85.0
2009-07-01	84.7
2009-10-01	84.2
2010-01-01	83.4
2010-04-01	84.2
2010-07-01	84.4
2010-10-01	84.1
2011-01-01	83.5
2011-04-01	84.2
2011-07-01	84.2
2011-10-01	83.5
2012-01-01	82.5
2012-04-01	82.9
2012-07-01	82.9
2012-10-01	82.3
2013-01-01	81.1
2013-04-01	81.8
2013-07-01	81.9
2013-10-01	81.8
2014-01-01	80.9
2014-04-01	81.9
2014-07-01	82.3
2014-10-01	82.1
2015-01-01	81.4
2015-04-01	82.3
2015-07-01	83.0
2015-10-01	82.8
2016-01-01	82.3
2016-04-01	83.4
2016-07-01	83.7
2016-10-01	83.5
2017-01-01	83.2
2017-04-01	84.2
2017-07-01	84.5
2017-10-01	84.3
2018-01-01	84.0
2018-04-01	85.0