Quarter	Percent
1998-01-01	8.3
1998-04-01	7.3
1998-07-01	7.0
1998-10-01	7.6
1999-01-01	8.4
1999-04-01	7.8
1999-07-01	7.9
1999-10-01	8.7
2000-01-01	8.3
2000-04-01	7.6
2000-07-01	7.2
2000-10-01	7.4
2001-01-01	7.6
2001-04-01	7.0
2001-07-01	7.0
2001-10-01	7.8
2002-01-01	7.8
2002-04-01	6.6
2002-07-01	6.4
2002-10-01	6.8
2003-01-01	7.0
2003-04-01	6.1
2003-07-01	5.9
2003-10-01	6.4
2004-01-01	7.6
2004-04-01	6.5
2004-07-01	6.3
2004-10-01	6.6
2005-01-01	6.8
2005-04-01	6.0
2005-07-01	6.3
2005-10-01	6.3
2006-01-01	6.5
2006-04-01	5.7
2006-07-01	5.3
2006-10-01	5.7
2007-01-01	5.9
2007-04-01	5.1
2007-07-01	5.0
2007-10-01	5.3
2008-01-01	5.7
2008-04-01	4.8
2008-07-01	4.8
2008-10-01	5.5
2009-01-01	7.0
2009-04-01	6.6
2009-07-01	6.8
2009-10-01	8.0
2010-01-01	9.3
2010-04-01	9.6
2010-07-01	10
2010-10-01	11.9
2011-01-01	13.7
2011-04-01	14.1
2011-07-01	15.4
2011-10-01	18.3
2012-01-01	20.2
2012-04-01	21.2
2012-07-01	22.1
2012-10-01	23.8
2013-01-01	25.1
2013-04-01	24.5
2013-07-01	24.2
2013-10-01	24.9
2014-01-01	25.2
2014-04-01	23.7
2014-07-01	22.8
2014-10-01	23.4
2015-01-01	23.7
2015-04-01	21.7
2015-07-01	20.8
2015-10-01	21.3
2016-01-01	21.3
2016-04-01	19.5
2016-07-01	19.0
2016-10-01	20.0
2017-01-01	19.9
2017-04-01	17.8
2017-07-01	16.6
2017-10-01	17.5
2018-01-01	17.4
2018-04-01	15.3