Quarterly Percent
1998-04-01 21.5
1999-04-01 22.3
2000-04-01 22
2001-04-01 20.5
2002-04-01 19.4
2003-04-01 19.5
2004-04-01 19.2
2005-04-01 18.7
2006-04-01 18.8
2007-04-01 18.1
2008-04-01 16.4
2009-04-01 16.1
2010-01-01 18.4
2010-04-01 18.0
2010-07-01 18.0
2010-10-01 17.8
2011-01-01 17.2
2011-04-01 17.4
2011-07-01 17.6
2011-10-01 16.4
2012-01-01 16.7
2012-04-01 16.5
2012-07-01 16.3
2012-10-01 16.1
2013-01-01 16.4
2013-04-01 16.5
2013-07-01 16.6
2013-10-01 16.3
2014-01-01 15.8
2014-04-01 15.5
2014-07-01 15.4
2014-10-01 14.3
2015-01-01 15.0
2015-04-01 15.0
2015-07-01 15.6
2015-10-01 15.1
2016-01-01 13.5
2016-04-01 15.0
2016-07-01 15.2
2016-10-01 14.2
2017-01-01 14.0
2017-04-01 14.8
2017-07-01 14.7
2017-10-01 14.3
2018-01-01 13.9
2018-04-01 13.9
