Quarter	Percent
1999-01-01	9.7
1999-04-01	9.6
1999-07-01	9.9
1999-10-01	10.1
2000-01-01	10.3
2000-04-01	9.8
2000-07-01	8.8
2000-10-01	8.9
2001-01-01	6.3
2001-04-01	6.3
2001-07-01	6.5
2001-10-01	6.6
2002-01-01	7.3
2002-04-01	7.1
2002-07-01	7.5
2002-10-01	7.3
2003-01-01	7.0
2003-04-01	6.8
2003-07-01	7.6
2003-10-01	6.9
2004-01-01	7.0
2004-04-01	7.5
2004-07-01	7.3
2004-10-01	7.1
2005-01-01	7.0
2005-04-01	7.0
2005-07-01	5.4
2005-10-01	5.9
2006-01-01	6.2
2006-04-01	5.7
2006-07-01	5.6
2006-10-01	5.6
2007-01-01	6.1
2007-04-01	5.8
2007-07-01	5.8
2007-10-01	6.1
2008-01-01	6.7
2008-04-01	6.7
2008-07-01	7.1
2008-10-01	8.8
2009-01-01	10.9
2009-04-01	12.2
2009-07-01	12.2
2009-10-01	13
2010-01-01	13.8
2010-04-01	14.1
2010-07-01	14.3
2010-10-01	14.7
2011-01-01	14.5
2011-04-01	14.3
2011-07-01	15.1
2011-10-01	16.4
2012-01-01	17.4
2012-04-01	17.8
2012-07-01	18
2012-10-01	18.9
2013-01-01	20.6
2013-04-01	19.9
2013-07-01	19.7
2013-10-01	19.9
2014-01-01	20.4
2014-04-01	20.3
2014-07-01	19.5
2014-10-01	19.7
2015-01-01	19.1
2015-04-01	18.6
2015-07-01	18.5
2015-10-01	18.3
2016-01-01	17.8
2016-04-01	17.1
2016-07-01	16.5
2016-10-01	16.7
2017-01-01	16.2
2017-04-01	15.5
2017-07-01	14.8
2017-10-01	14.9
2018-01-01	15.3
2018-04-01	14.0
2018-07-01	12.6