Quarter	Percent
1998-04-01	21.5
1999-04-01	21.8
2000-04-01	22.2
2001-04-01	22.6
2002-04-01	23.3
2003-04-01	23.2
2004-04-01	24
2005-04-01	24.9
2006-04-01	24.6
2007-04-01	24.2
2008-04-01	24.5
2009-04-01	24.8
2010-01-01	26.1
2010-04-01	25.5
2010-07-01	25.2
2010-10-01	25.8
2011-01-01	25.5
2011-04-01	25.6
2011-07-01	25.0
2011-10-01	25.1
2012-01-01	26.0
2012-04-01	25.9
2012-07-01	24.9
2012-10-01	25.2
2013-01-01	25.7
2013-04-01	26.0
2013-07-01	25.9
2013-10-01	25.7
2014-01-01	26.1
2014-04-01	25.8
2014-07-01	25.8
2014-10-01	25.7
2015-01-01	25.8
2015-04-01	26.0
2015-07-01	25.9
2015-10-01	25.4
2016-01-01	25.7
2016-04-01	25.8
2016-07-01	25.3
2016-10-01	25.2
2017-01-01	26.0
2017-04-01	25.7
2017-07-01	25.2
2017-10-01	25.3
2018-01-01	26.1
2018-04-01	25.6