Quarter	Percent
2005-01-01	87.3
2005-04-01	85.5
2005-07-01	84.7
2005-10-01	85.8
2006-01-01	83.0
2006-04-01	82.8
2006-07-01	84.5
2006-10-01	82.5
2007-01-01	83.5
2007-04-01	84.2
2007-07-01	84.1
2007-10-01	82.6
2008-01-01	82.6
2008-04-01	81.8
2008-07-01	84.4
2008-10-01	85.4
2009-01-01	85.4
2009-04-01	85.7
2009-07-01	86.6
2009-10-01	86.2
2010-01-01	86.0
2010-04-01	87.3
2010-07-01	89.2
2010-10-01	88.7
2011-01-01	88.4
2011-04-01	89.2
2011-07-01	89.3
2011-10-01	88.7
2012-01-01	89.3
2012-04-01	89.4
2012-07-01	88.6
2012-10-01	88.6
2013-01-01	88.5
2013-04-01	89.0
2013-07-01	87.6
2013-10-01	88.2
2014-01-01	88.9
2014-04-01	89.3
2014-07-01	88.5
2014-10-01	88.2
2015-01-01	88.0
2015-04-01	88.5
2015-07-01	88.8
2015-10-01	87.7
2016-01-01	87.8
2016-04-01	89.5
2016-07-01	88.6
2016-10-01	88.0
2017-01-01	87.4
2017-04-01	88.2
2017-07-01	88.7
2017-10-01	88.3
2018-01-01	86.9
2018-04-01	87.4