Quarter	Percent
1998-01-01	9.7
1998-04-01	9.0
1998-07-01	8.7
1998-10-01	9.4
1999-01-01	10.3
1999-04-01	9.9
1999-07-01	9.9
1999-10-01	10.8
2000-01-01	10.7
2000-04-01	9.7
2000-07-01	9.3
2000-10-01	9.4
2001-01-01	9.8
2001-04-01	8.9
2001-07-01	8.8
2001-10-01	9.8
2002-01-01	10
2002-04-01	8.8
2002-07-01	8.7
2002-10-01	9.1
2003-01-01	9.4
2003-04-01	8.4
2003-07-01	8.3
2003-10-01	9.0
2004-01-01	10.1
2004-04-01	9.2
2004-07-01	9.3
2004-10-01	9.5
2005-01-01	9.7
2005-04-01	9.0
2005-07-01	9.0
2005-10-01	9.0
2006-01-01	9.0
2006-04-01	8.1
2006-07-01	7.7
2006-10-01	8.0
2007-01-01	8.5
2007-04-01	7.7
2007-07-01	7.4
2007-10-01	7.7
2008-01-01	7.9
2008-04-01	6.8
2008-07-01	6.7
2008-10-01	7.5
2009-01-01	8.9
2009-04-01	8.5
2009-07-01	8.9
2009-10-01	9.9
2010-01-01	11.3
2010-04-01	11.4
2010-07-01	12
2010-10-01	13.8
2011-01-01	15.6
2011-04-01	15.8
2011-07-01	17.2
2011-10-01	20.3
2012-01-01	22.2
2012-04-01	23.1
2012-07-01	24.2
2012-10-01	25.5
2013-01-01	26.8
2013-04-01	26.7
2013-07-01	26.8
2013-10-01	27.3
2014-01-01	27.2
2014-04-01	26.1
2014-07-01	25.2
2014-10-01	25.6
2015-01-01	26.2
2015-04-01	24.1
2015-07-01	23.6
2015-10-01	23.9
2016-01-01	24.2
2016-04-01	22.1
2016-07-01	22.0
2016-10-01	22.9
2017-01-01	22.6
2017-04-01	20.3
2017-07-01	19.4
2017-10-01	20.6
2018-01-01	20.7
2018-04-01	18.5