Quarter	Percent
1998-04-01	97.1
1999-04-01	97.3
2000-04-01	96.7
2001-04-01	96.3
2002-04-01	96
2003-04-01	95.6
2004-04-01	95.7
2005-04-01	95.6
2006-04-01	95.5
2007-04-01	95.8
2008-04-01	95.9
2009-04-01	96
2010-01-01	94.4
2010-04-01	94.8
2010-07-01	94.9
2010-10-01	94.4
2011-01-01	95.1
2011-04-01	95.3
2011-07-01	95.2
2011-10-01	94.8
2012-01-01	95.0
2012-04-01	95.3
2012-07-01	95.4
2012-10-01	94.9
2013-01-01	94.5
2013-04-01	94.5
2013-07-01	95.0
2013-10-01	94.9
2014-01-01	94.8
2014-04-01	95.1
2014-07-01	95.2
2014-10-01	95.1
2015-01-01	95.5
2015-04-01	95.3
2015-07-01	95.2
2015-10-01	95.8
2016-01-01	95.7
2016-04-01	95.7
2016-07-01	95.5
2016-10-01	95.3
2017-01-01	95.2
2017-04-01	95.3
2017-07-01	95.1
2017-10-01	95.1
2018-01-01	95.4
2018-04-01	95.3