Quarter	Percent
1999-01-01	10.2
1999-04-01	9.0
1999-07-01	8.6
1999-10-01	8.8
2000-01-01	8.6
2000-04-01	7.9
2000-07-01	7.5
2000-10-01	7.8
2001-01-01	6.7
2001-04-01	6.2
2001-07-01	6.1
2001-10-01	6.4
2002-01-01	7.1
2002-04-01	6.7
2002-07-01	7.0
2002-10-01	7.2
2003-01-01	7.4
2003-04-01	7.0
2003-07-01	7.0
2003-10-01	7.3
2004-01-01	7.5
2004-04-01	7.0
2004-07-01	7.0
2004-10-01	6.6
2005-01-01	6.6
2005-04-01	6.1
2005-07-01	5.5
2005-10-01	5.6
2006-01-01	5.7
2006-04-01	5.4
2006-07-01	5.1
2006-10-01	5.3
2007-01-01	5.5
2007-04-01	5.1
2007-07-01	5.2
2007-10-01	5.9
2008-01-01	6.8
2008-04-01	7.9
2008-07-01	9.1
2008-10-01	11.8
2009-01-01	15.6
2009-04-01	15.9
2009-07-01	16
2009-10-01	17.1
2010-01-01	18.3
2010-04-01	17.8
2010-07-01	17.5
2010-10-01	18.1
2011-01-01	19
2011-04-01	18.7
2011-07-01	19.2
2011-10-01	20.6
2012-01-01	22.3
2012-04-01	22.9
2012-07-01	23
2012-10-01	23.9
2013-01-01	24.9
2013-04-01	23.7
2013-07-01	23.4
2013-10-01	23.2
2014-01-01	23.6
2014-04-01	21.8
2014-07-01	20.4
2014-10-01	20.9
2015-01-01	21.0
2015-04-01	19.1
2015-07-01	18.0
2015-10-01	17.7
2016-01-01	17.8
2016-04-01	16.5
2016-07-01	15.7
2016-10-01	15.4
2017-01-01	15.5
2017-04-01	13.8
2017-07-01	13.0
2017-10-01	13.3
2018-01-01	13.6
2018-04-01	12.0
2018-07-01	11.6