Quarter	Percent
1999-04-01	90.1
2000-01-01	88.3
2000-04-01	89.3
2000-07-01	89.3
2000-10-01	88.8
2001-01-01	88.7
2001-04-01	89.1
2001-07-01	89.4
2001-10-01	88.9
2002-01-01	88.1
2002-04-01	88.9
2002-07-01	88.6
2002-10-01	87.6
2003-01-01	86.7
2003-04-01	86.3
2003-07-01	86.1
2003-10-01	85.9
2004-01-01	86
2004-04-01	86.5
2004-07-01	86.7
2004-10-01	86.1
2005-01-01	86.1
2005-04-01	86.4
2005-07-01	86.3
2005-10-01	87.1
2006-01-01	87.2
2006-04-01	87.6
2006-07-01	87.8
2006-10-01	88.3
2007-01-01	88.2
2007-04-01	89
2007-07-01	89.4
2007-10-01	89.8
2008-01-01	88.9
2008-04-01	89.8
2008-07-01	89.9
2008-10-01	89.1
2009-01-01	88.7
2009-04-01	88.9
2009-07-01	88
2009-10-01	87.6
2010-01-01	86.6
2010-04-01	87.3
2010-07-01	87.2
2010-10-01	87.3
2011-01-01	86.5
2011-04-01	87.1
2011-07-01	87.5
2011-10-01	87.1
2012-01-01	86.8
2012-04-01	86.9
2012-07-01	87.3
2012-10-01	86.8
2013-01-01	86.1
2013-04-01	86.8
2013-07-01	86.7
2013-10-01	86.5
2014-01-01	85.9
2014-04-01	86.7
2014-07-01	87.1
2014-10-01	85.4
2015-01-01	85.3
2015-04-01	85.8
2015-07-01	85.1
2015-10-01	85.0
2016-01-01	84.5
2016-04-01	84.5
2016-07-01	84.8
2016-10-01	84.0
2017-01-01	84.1
2017-04-01	84.5
2017-07-01	84.5
2017-10-01	84.1
2018-01-01	84.6
2018-04-01	85.9