Quarter	Percent
1999-04-01	32.6
2000-04-01	33.3
2001-04-01	33.8
2002-04-01	34.3
2003-04-01	34.6
2004-04-01	35.3
2005-01-01	34.2
2005-04-01	33.8
2005-07-01	33.6
2005-10-01	33.8
2006-01-01	34
2006-04-01	33.9
2006-07-01	33.6
2006-10-01	33.2
2007-01-01	34.3
2007-04-01	34
2007-07-01	33.2
2007-10-01	33.5
2008-01-01	34
2008-04-01	34.2
2008-07-01	33.1
2008-10-01	33.5
2009-01-01	33.9
2009-04-01	34.2
2009-07-01	33.7
2009-10-01	33.4
2010-01-01	33.9
2010-04-01	34.2
2010-07-01	33.8
2010-10-01	33.8
2011-01-01	33.9
2011-04-01	33.5
2011-07-01	33.2
2011-10-01	33.2
2012-01-01	33.9
2012-04-01	33.8
2012-07-01	33
2012-10-01	33.5
2013-01-01	34
2013-04-01	33.5
2013-07-01	33.4
2013-10-01	33.5
2014-01-01	34
2014-04-01	33.9
2014-07-01	33.2
2014-10-01	33.6
2015-01-01	34.3
2015-04-01	34.7
2015-07-01	33.9
2015-10-01	33.7
2016-01-01	33.6
2016-04-01	33.8
2016-07-01	33.1
2016-10-01	33.2
2017-01-01	33.7
2017-04-01	33.5
2017-07-01	33.0
2017-10-01	33.0
2018-01-01	33.5
2018-04-01	33.5