Quarter	Percent
1998-01-01	6.6
1998-04-01	5.7
1998-07-01	5.4
1998-10-01	6.0
1999-01-01	6.8
1999-04-01	6.2
1999-07-01	6.3
1999-10-01	7.3
2000-01-01	7.0
2000-04-01	6.1
2000-07-01	5.8
2000-10-01	5.9
2001-01-01	6.3
2001-04-01	5.6
2001-07-01	5.5
2001-10-01	6.4
2002-01-01	6.6
2002-04-01	5.4
2002-07-01	5.3
2002-10-01	5.7
2003-01-01	6.0
2003-04-01	5.2
2003-07-01	4.9
2003-10-01	5.4
2004-01-01	6.2
2004-04-01	5.4
2004-07-01	5.4
2004-10-01	5.6
2005-01-01	5.8
2005-04-01	5.2
2005-07-01	5.3
2005-10-01	5.5
2006-01-01	5.7
2006-04-01	5.0
2006-07-01	4.5
2006-10-01	4.8
2007-01-01	5.1
2007-04-01	4.6
2007-07-01	4.5
2007-10-01	4.7
2008-01-01	5.1
2008-04-01	4.2
2008-07-01	4.1
2008-10-01	4.8
2009-01-01	6.4
2009-04-01	6.0
2009-07-01	6.3
2009-10-01	7.3
2010-01-01	8.6
2010-04-01	8.9
2010-07-01	9.4
2010-10-01	11
2011-01-01	13
2011-04-01	13.3
2011-07-01	14.5
2011-10-01	17.5
2012-01-01	19.4
2012-04-01	20.5
2012-07-01	21.3
2012-10-01	22.8
2013-01-01	24
2013-04-01	23.5
2013-07-01	23.3
2013-10-01	24
2014-01-01	24.3
2014-04-01	22.9
2014-07-01	22
2014-10-01	22.6
2015-01-01	22.6
2015-04-01	20.7
2015-07-01	19.9
2015-10-01	20.3
2016-01-01	19.8
2016-04-01	17.8
2016-07-01	17.6
2016-10-01	18.6
2017-01-01	18.5
2017-04-01	16.4
2017-07-01	15.3
2017-10-01	16.5
2018-01-01	16.5
2018-04-01	14.4