Quarter	Percent
1998-01-01	7.4
1998-04-01	5.7
1998-07-01	6.1
1998-10-01	6.1
1999-01-01	5.9
1999-04-01	5.1
1999-07-01	5.0
1999-10-01	5.1
2000-01-01	5.4
2000-04-01	4.8
2000-07-01	5.1
2000-10-01	4.9
2001-01-01	5.5
2001-04-01	5.0
2001-07-01	4.8
2001-10-01	5.1
2002-01-01	5.3
2002-04-01	5.4
2002-07-01	6.2
2002-10-01	7.6
2003-01-01	7.4
2003-04-01	7.4
2003-07-01	7.0
2003-10-01	7.6
2004-01-01	7.5
2004-04-01	7.3
2004-07-01	7.9
2004-10-01	8.0
2005-01-01	8.7
2005-04-01	8.1
2005-07-01	8.9
2005-10-01	9.2
2006-01-01	9.2
2006-04-01	8.4
2006-07-01	9.0
2006-10-01	9.6
2007-01-01	10
2007-04-01	9.5
2007-07-01	9.4
2007-10-01	9.7
2008-01-01	9.0
2008-04-01	8.4
2008-07-01	9.1
2008-10-01	9.1
2009-01-01	9.8
2009-04-01	9.7
2009-07-01	10.8
2009-10-01	10.8
2010-01-01	11.6
2010-04-01	11.7
2010-07-01	12.5
2010-10-01	12.4
2011-01-01	13
2011-04-01	12.5
2011-07-01	13.1
2011-10-01	14.2
2012-01-01	15.2
2012-04-01	15
2012-07-01	15.5
2012-10-01	17.1
2013-01-01	17.6
2013-04-01	16.7
2013-07-01	16
2013-10-01	16
2014-01-01	15.3
2014-04-01	14.5
2014-07-01	14.2
2014-10-01	13.9
2015-01-01	14.5
2015-04-01	11.9
2015-07-01	12.4
2015-10-01	12.5
2016-01-01	12.5
2016-04-01	11.0
2016-07-01	10.8
2016-10-01	10.6
2017-01-01	10.5
2017-04-01	9.4
2017-07-01	9.3
2017-10-01	8.5
2018-01-01	8.1
2018-04-01	7.1