Quarter	Percent
1999-04-01	96.4
2000-04-01	96
2001-04-01	95.2
2002-04-01	94.6
2003-01-01	91.4
2003-04-01	92.8
2003-07-01	92.3
2003-10-01	91
2004-01-01	90.2
2004-04-01	92.2
2004-07-01	92.9
2004-10-01	92.2
2005-01-01	90.6
2005-04-01	93
2005-07-01	94
2005-10-01	91.7
2006-01-01	91.7
2006-04-01	93.5
2006-07-01	93.8
2006-10-01	94.1
2007-01-01	93
2007-04-01	93.1
2007-07-01	94.1
2007-10-01	94.1
2008-01-01	92.7
2008-04-01	94.1
2008-07-01	91.7
2008-10-01	90.5
2009-01-01	83.9
2009-04-01	85.9
2009-07-01	87.7
2009-10-01	87
2010-01-01	85.4
2010-04-01	87.2
2010-07-01	86.4
2010-10-01	86
2011-01-01	84.9
2011-04-01	85.8
2011-07-01	87.7
2011-10-01	89.2
2012-01-01	86.7
2012-04-01	86.7
2012-07-01	88.1
2012-10-01	87.7
2013-01-01	85.9
2013-04-01	88.9
2013-07-01	89.5
2013-10-01	88.5
2014-01-01	87.6
2014-04-01	91.4
2014-07-01	91.4
2014-10-01	90.1
2015-01-01	90.8
2015-04-01	93.0
2015-07-01	93.3
2015-10-01	91.2
2016-01-01	91.9
2016-04-01	93.2
2016-07-01	93.7
2016-10-01	93.9
2017-01-01	92.7
2017-04-01	93.8
2017-07-01	93.0
2017-10-01	90.8
2018-01-01	91.3
2018-04-01	92.2