Quarterly Percent
1999-04-01 20.7
2000-04-01 21.2
2001-04-01 21.2
2002-04-01 21.3
2003-04-01 21
2004-04-01 21
2005-01-01 19.9
2005-04-01 19.4
2005-07-01 19.1
2005-10-01 19.3
2006-01-01 19.1
2006-04-01 19
2006-07-01 18.5
2006-10-01 18.3
2007-01-01 18.4
2007-04-01 18.7
2007-07-01 17.8
2007-10-01 18.2
2008-01-01 18.1
2008-04-01 18.2
2008-07-01 17.7
2008-10-01 18
2009-01-01 18
2009-04-01 18
2009-07-01 17.6
2009-10-01 17.7
2010-01-01 17.6
2010-04-01 17.7
2010-07-01 17.4
2010-10-01 17.5
2011-01-01 17.6
2011-04-01 17.5
2011-07-01 17.3
2011-10-01 16.9
2012-01-01 17.7
2012-04-01 17.7
2012-07-01 17.1
2012-10-01 17.3
2013-01-01 17.7
2013-04-01 17.4
2013-07-01 17.3
2013-10-01 17.2
2014-01-01 17.6
2014-04-01 17.9
2014-07-01 17.1
2014-10-01 17.3
2015-01-01 17.8
2015-04-01 18.5
2015-07-01 17.7
2015-10-01 17.4
2016-01-01 18.2
2016-04-01 18.2
2016-07-01 17.5
2016-10-01 17.5
2017-01-01 18.0
2017-04-01 17.9
2017-07-01 17.4
2017-10-01 17.2
2018-01-01 17.4
2018-04-01 17.4