Quarter	Percent
1998-04-01	3.7
1999-04-01	3.2
2000-04-01	2.7
2001-04-01	2.5
2002-04-01	3.0
2003-04-01	4.2
2004-04-01	4.4
2005-04-01	4.5
2006-04-01	4.1
2007-04-01	3.7
2008-04-01	3.4
2009-04-01	4.2
2010-01-01	5.5
2010-04-01	4.8
2010-07-01	5.0
2010-10-01	4.4
2011-01-01	4.8
2011-04-01	4.0
2011-07-01	4.7
2011-10-01	4.5
2012-01-01	4.7
2012-04-01	4.2
2012-07-01	4.8
2012-10-01	4.8
2013-01-01	5.3
2013-04-01	4.7
2013-07-01	5.0
2013-10-01	4.6
2014-01-01	5.5
2014-04-01	4.8
2014-07-01	5.2
2014-10-01	4.4
2015-01-01	4.8
2015-04-01	4.5
2015-07-01	5.3
2015-10-01	5.0
2016-01-01	5.5
2016-04-01	4.8
2016-07-01	5.3
2016-10-01	4.8
2017-01-01	5.4
2017-04-01	4.5
2017-07-01	5.2
2017-10-01	4.7
2018-01-01	5.4
2018-04-01	4.8