Quarter	Percent
1998-01-01	3.9
1998-04-01	3.8
1998-07-01	3.4
1998-10-01	3.2
1999-01-01	3.2
1999-04-01	4.5
1999-07-01	4.2
1999-10-01	3.7
2000-01-01	4.0
2000-04-01	3.8
2000-07-01	3.1
2000-10-01	3.5
2001-01-01	3.4
2001-04-01	2.4
2001-07-01	3.5
2001-10-01	3.3
2002-01-01	3.7
2002-04-01	3.3
2002-07-01	3.8
2002-10-01	3.9
2003-01-01	3.4
2003-04-01	4.9
2003-07-01	4.7
2003-10-01	5.8
2004-01-01	4.9
2004-04-01	6.3
2004-07-01	5.9
2004-10-01	6.3
2005-01-01	6.3
2005-04-01	6.2
2005-07-01	7.3
2005-10-01	7.6
2006-01-01	7.3
2006-04-01	6.8
2006-07-01	7.2
2006-10-01	7.7
2007-01-01	6.8
2007-04-01	7.6
2007-07-01	7.2
2007-10-01	6.8
2008-01-01	7.6
2008-04-01	8.0
2008-07-01	6.8
2008-10-01	6.7
2009-01-01	7.2
2009-04-01	8.2
2009-07-01	9.0
2009-10-01	8.5
2010-01-01	9.5
2010-04-01	10
2010-07-01	10.2
2010-10-01	10
2011-01-01	11
2011-04-01	12.5
2011-07-01	11.8
2011-10-01	12.4
2012-01-01	12.8
2012-04-01	14.2
2012-07-01	14.1
2012-10-01	16.9
2013-01-01	15.4
2013-04-01	15.6
2013-07-01	13.8
2013-10-01	13.9
2014-01-01	16
2014-04-01	15.2
2014-07-01	13.8
2014-10-01	15.8
2015-01-01	15.1
2015-04-01	13.5
2015-07-01	13.5
2015-10-01	13.7
2016-01-01	14.6
2016-04-01	12.9
2016-07-01	11.2
2016-10-01	11.9
2017-01-01	11.3
2017-04-01	9.0
2017-07-01	8.0
2017-10-01	7.7
2018-01-01	7.6
2018-04-01	6.9