Quarter	Percent
1999-04-01	90.7
2000-04-01	91.6
2001-04-01	92.3
2002-04-01	91.1
2003-01-01	87.9
2003-04-01	91.6
2003-07-01	91
2003-10-01	88
2004-01-01	85.8
2004-04-01	91.3
2004-07-01	89.7
2004-10-01	87.3
2005-01-01	86
2005-04-01	91
2005-07-01	91.3
2005-10-01	88.8
2006-01-01	87.4
2006-04-01	92.7
2006-07-01	91.4
2006-10-01	90.5
2007-01-01	89.7
2007-04-01	92.5
2007-07-01	91.8
2007-10-01	90.6
2008-01-01	89
2008-04-01	92.7
2008-07-01	90.9
2008-10-01	88.5
2009-01-01	86.2
2009-04-01	90
2009-07-01	88.7
2009-10-01	86.1
2010-01-01	86.6
2010-04-01	89.8
2010-07-01	86.9
2010-10-01	86.9
2011-01-01	85.9
2011-04-01	89.1
2011-07-01	87.3
2011-10-01	86.7
2012-01-01	85.5
2012-04-01	89.2
2012-07-01	88.1
2012-10-01	85.5
2013-01-01	85
2013-04-01	90.5
2013-07-01	90.2
2013-10-01	87.2
2014-01-01	88.1
2014-04-01	92.5
2014-07-01	90.7
2014-10-01	88.7
2015-01-01	89.0
2015-04-01	92.8
2015-07-01	92.7
2015-10-01	88.9
2016-01-01	90.8
2016-04-01	93.5
2016-07-01	93.7
2016-10-01	91.1
2017-01-01	91.0
2017-04-01	94.1
2017-07-01	90.8
2017-10-01	89.3
2018-01-01	89.1
2018-04-01	91.5