Quarter	Percent
1998-01-01	6.2
1999-01-01	6.2
1999-04-01	5.9
1999-07-01	6.3
1999-10-01	6.2
2000-01-01	6.4
2000-04-01	5.9
2000-07-01	5.8
2000-10-01	5.9
2001-01-01	6.5
2001-04-01	6.6
2001-07-01	6.0
2001-10-01	6.3
2002-01-01	6.1
2002-04-01	5.9
2002-07-01	5.6
2002-10-01	5.4
2003-01-01	5.8
2003-04-01	5.5
2003-07-01	5.1
2003-10-01	5.1
2004-01-01	9.5
2004-04-01	7.3
2004-07-01	7.0
2004-10-01	8.0
2005-01-01	9.7
2005-04-01	7.6
2005-07-01	7.1
2005-10-01	7.6
2006-01-01	9.3
2006-04-01	7.3
2006-07-01	7.0
2006-10-01	7.7
2007-01-01	8.6
2007-04-01	7.1
2007-07-01	6.6
2007-10-01	7.5
2008-01-01	9.0
2008-04-01	7.2
2008-07-01	7.3
2008-10-01	8.1
2009-01-01	9.7
2009-04-01	7.6
2009-07-01	7.3
2009-10-01	7.7
2010-01-01	9.8
2010-04-01	7.5
2010-07-01	7.0
2010-10-01	8.0
2011-01-01	9.5
2011-04-01	7.6
2011-07-01	7.4
2011-10-01	7.6
2012-01-01	9.4
2012-04-01	7.1
2012-07-01	6.9
2012-10-01	7.5
2013-01-01	8.7
2013-04-01	7.5
2013-07-01	7.0
2013-10-01	8.4
2014-01-01	10.2
2014-04-01	8.1
2014-07-01	7.4
2014-10-01	8.6
2015-01-01	9.5
2015-04-01	7.9
2015-07-01	7.7
2015-10-01	8.4
2016-01-01	9.7
2016-04-01	7.7
2016-07-01	7.2
2016-10-01	8.3
2017-01-01	9.3
2017-04-01	7.3
2017-07-01	6.9
2017-10-01	7.5
2018-01-01	8.8
2018-04-01	7.5