Quarterly Percent
1998-04-01 19.0
1999-04-01 19
2000-04-01 19.5
2001-04-01 18.8
2002-04-01 18.7
2003-04-01 18.7
2004-04-01 19
2005-04-01 19.1
2006-04-01 18.8
2007-04-01 18.4
2008-04-01 17.7
2009-04-01 17.5
2010-01-01 18.9
2010-04-01 18.9
2010-07-01 18.3
2010-10-01 18.8
2011-01-01 18.1
2011-04-01 18.2
2011-07-01 17.8
2011-10-01 17.6
2012-01-01 18.0
2012-04-01 18.1
2012-07-01 17.1
2012-10-01 17.6
2013-01-01 17.7
2013-04-01 17.9
2013-07-01 17.5
2013-10-01 17.3
2014-01-01 17.6
2014-04-01 17.4
2014-07-01 17.0
2014-10-01 16.4
2015-01-01 16.8
2015-04-01 17.1
2015-07-01 16.8
2015-10-01 16.1
2016-01-01 15.9
2016-04-01 16.6
2016-07-01 16.2
2016-10-01 15.8
2017-01-01 16.2
2017-04-01 16.4
2017-07-01 15.8
2017-10-01 15.8
2018-01-01 16.0
2018-04-01 16.1
