Quarter	Percent
1999-04-01	25
1999-07-01	24.2
1999-10-01	24.3
2000-01-01	24.8
2000-04-01	24.8
2000-07-01	24.1
2000-10-01	24.5
2001-01-01	24.8
2001-04-01	25.1
2001-07-01	24.4
2001-10-01	24.6
2002-01-01	25.1
2002-04-01	25
2002-07-01	24.3
2002-10-01	24.4
2003-01-01	25
2003-04-01	24.9
2003-07-01	24.4
2003-10-01	24.6
2004-01-01	24.7
2004-04-01	25
2004-07-01	24.6
2004-10-01	24.6
2005-01-01	24.6
2005-04-01	25
2005-07-01	24.4
2005-10-01	24.5
2006-01-01	24.6
2006-04-01	24.5
2006-07-01	23.8
2006-10-01	24.3
2007-01-01	24.7
2007-04-01	24.8
2007-07-01	24.2
2007-10-01	24.3
2008-01-01	24.5
2008-04-01	24.4
2008-07-01	23.9
2008-10-01	24.0
2009-01-01	24.2
2009-04-01	24.6
2009-07-01	24.1
2009-10-01	24.5
2010-01-01	25
2010-04-01	24.9
2010-07-01	24
2010-10-01	24.6
2011-01-01	24.8
2011-04-01	24.8
2011-07-01	24.1
2011-10-01	24.3
2012-01-01	24.5
2012-04-01	24.3
2012-07-01	23.5
2012-10-01	23.5
2013-01-01	23.9
2013-04-01	23.9
2013-07-01	23.1
2013-10-01	23.4
2014-01-01	23.5
2014-04-01	23.5
2014-07-01	22.9
2014-10-01	23.3
2015-01-01	23.4
2015-04-01	23.4
2015-07-01	22.8
2015-10-01	22.8
2016-01-01	23.0
2016-04-01	22.8
2016-07-01	22.4
2016-10-01	22.6
2017-01-01	22.7
2017-04-01	22.5
2017-07-01	22.3
2017-10-01	22.2
2018-01-01	22.1
2018-04-01	22.4