Quarter	Percent
1998-04-01	91.1
1998-10-01	91.4
1999-04-01	90.2
1999-10-01	89.9
2000-04-01	88.5
2000-10-01	87.2
2001-04-01	88.5
2001-10-01	90.2
2002-01-01	87.7
2002-04-01	90.5
2002-07-01	90.1
2002-10-01	88.8
2003-01-01	90.1
2003-04-01	89.2
2003-07-01	91.0
2003-10-01	88.4
2004-01-01	88.0
2004-04-01	90.3
2004-07-01	89.6
2004-10-01	88.7
2005-01-01	88.8
2005-04-01	90.1
2005-07-01	89.4
2005-10-01	88.3
2006-01-01	88.7
2006-04-01	89.8
2006-07-01	91.5
2006-10-01	90.8
2007-01-01	90.0
2007-04-01	91.4
2007-07-01	92.9
2007-10-01	92.2
2008-01-01	91.0
2008-04-01	91.6
2008-07-01	92.1
2008-10-01	93.4
2009-01-01	91.2
2009-04-01	90.7
2009-07-01	92.0
2009-10-01	90.6
2010-01-01	90.4
2010-04-01	89.9
2010-07-01	91.6
2010-10-01	92.1
2011-01-01	90.5
2011-04-01	91.0
2011-07-01	90.1
2011-10-01	91.8
2012-01-01	90.3
2012-04-01	91.0
2012-07-01	90.8
2012-10-01	92.7
2013-01-01	91.2
2013-04-01	88.7
2013-07-01	91.0
2013-10-01	91.4
2014-01-01	91.0
2014-04-01	90.6
2014-07-01	90.0
2014-10-01	90.3
2015-01-01	90.4
2015-04-01	91.4
2015-07-01	90.9
2015-10-01	89.8
2016-01-01	90.3
2016-04-01	90.5
2016-07-01	90.4
2016-10-01	89.8
2017-01-01	91.7
2017-04-01	91.4
2017-07-01	91.8
2017-10-01	92.3
2018-01-01	92.2
2018-04-01	92.4