Quarter	Percent
2005-01-01	88.6
2005-04-01	88.0
2005-07-01	87.4
2005-10-01	87.3
2006-01-01	85.8
2006-04-01	85.6
2006-07-01	86.3
2006-10-01	85.1
2007-01-01	85.3
2007-04-01	85.8
2007-07-01	86.2
2007-10-01	84.9
2008-01-01	84.5
2008-04-01	84.4
2008-07-01	85.9
2008-10-01	86.7
2009-01-01	85.9
2009-04-01	86.7
2009-07-01	87.8
2009-10-01	87.4
2010-01-01	86.7
2010-04-01	87.9
2010-07-01	89.5
2010-10-01	89.4
2011-01-01	89.5
2011-04-01	90.3
2011-07-01	89.8
2011-10-01	89.4
2012-01-01	89.6
2012-04-01	90.2
2012-07-01	89.7
2012-10-01	89.4
2013-01-01	89.3
2013-04-01	90.1
2013-07-01	89.1
2013-10-01	89.4
2014-01-01	89.9
2014-04-01	90.0
2014-07-01	89.6
2014-10-01	89.4
2015-01-01	89.2
2015-04-01	89.2
2015-07-01	89.6
2015-10-01	89.2
2016-01-01	89.0
2016-04-01	89.9
2016-07-01	89.3
2016-10-01	89.1
2017-01-01	88.9
2017-04-01	89.3
2017-07-01	89.6
2017-10-01	89.3
2018-01-01	88.6
2018-04-01	89.4