Quarter	Percent
1998-01-01	5.1
1998-04-01	4.0
1998-07-01	4.0
1998-10-01	4.1
1999-01-01	4.3
1999-04-01	4.4
1999-07-01	4.1
1999-10-01	3.9
2000-01-01	4.0
2000-04-01	3.2
2000-07-01	3.3
2000-10-01	3.1
2001-01-01	3.3
2001-04-01	3.1
2001-07-01	3.5
2001-10-01	3.6
2002-01-01	3.9
2002-04-01	4.1
2002-07-01	4.4
2002-10-01	5.2
2003-01-01	5.9
2003-04-01	5.5
2003-07-01	5.9
2003-10-01	6.0
2004-01-01	5.8
2004-04-01	5.9
2004-07-01	6.3
2004-10-01	6.7
2005-01-01	6.9
2005-04-01	6.9
2005-07-01	7.1
2005-10-01	7.4
2006-01-01	7.0
2006-04-01	6.8
2006-07-01	6.6
2006-10-01	7.5
2007-01-01	7.6
2007-04-01	6.9
2007-07-01	7.0
2007-10-01	6.6
2008-01-01	6.8
2008-04-01	6.7
2008-07-01	6.9
2008-10-01	7.2
2009-01-01	8.6
2009-04-01	9.2
2009-07-01	9.7
2009-10-01	10.1
2010-01-01	10.4
2010-04-01	10.3
2010-07-01	10.2
2010-10-01	10.7
2011-01-01	12.7
2011-04-01	12.6
2011-07-01	12.7
2011-10-01	14.7
2012-01-01	15.5
2012-04-01	15.9
2012-07-01	17
2012-10-01	17.8
2013-01-01	18.8
2013-04-01	17.3
2013-07-01	16.2
2013-10-01	15.7
2014-01-01	15.8
2014-04-01	14.3
2014-07-01	13
2014-10-01	13.8
2015-01-01	13.7
2015-04-01	12.6
2015-07-01	12.1
2015-10-01	12.6
2016-01-01	13.0
2016-04-01	11.3
2016-07-01	10.9
2016-10-01	10.9
2017-01-01	10.2
2017-04-01	8.8
2017-07-01	8.1
2017-10-01	8.1
2018-01-01	8.0
2018-04-01	6.7