Quarterly Percent
1998-01-01 88.7
1998-04-01 88.5
1998-07-01 88.4
1998-10-01 88.5
1999-01-01 88.5
1999-04-01 88.6
1999-07-01 88.6
1999-10-01 88.6
2000-01-01 88.5
2000-04-01 88.5
2000-07-01 88.3
2000-10-01 88.3
2001-01-01 88.6
2001-04-01 88.4
2001-07-01 88.4
2001-10-01 88.3
2002-01-01 88
2002-04-01 88.2
2002-07-01 88.2
2002-10-01 88.4
2003-01-01 87.9
2003-04-01 88
2003-07-01 87.6
2003-10-01 87.6
2004-01-01 87.5
2004-04-01 87.8
2004-07-01 87.9
2004-10-01 88
2005-01-01 87.8
2005-04-01 88.4
2005-07-01 88.6
2005-10-01 88.4
2006-01-01 88.3
2006-04-01 88.2
2006-07-01 88.1
2006-10-01 88
2007-01-01 87.8
2007-04-01 87.8
2007-07-01 87.7
2007-10-01 87.8
2008-01-01 87.3
2008-04-01 87.4
2008-07-01 87.3
2008-10-01 87.2
2009-01-01 87.1
2009-04-01 87.5
2009-07-01 87.9
2009-10-01 88.1
2010-01-01 87.7
2010-04-01 87.9
2010-07-01 87.9
2010-10-01 87.8
2011-01-01 87.7
2011-04-01 88.1
2011-07-01 88.1
2011-10-01 88.3
2012-01-01 87.9
2012-04-01 88.2
2012-07-01 88.6
2012-10-01 88.6
2013-01-01 88.7
2013-04-01 89.3
2013-07-01 89.2
2013-10-01 89.1
2014-01-01 88.8
2014-04-01 88.7
2014-07-01 88.6
2014-10-01 88.9
2015-01-01 88.7
2015-04-01 88.5
2015-07-01 88.6
2015-10-01 88.6
2016-01-01 88.6
2016-04-01 88.8
2016-07-01 89.0
2016-10-01 89.2
2017-01-01 88.7
2017-04-01 88.9
2017-07-01 89.3
2017-10-01 89.3
2018-01-01 88.9
2018-04-01 89.3