Quarter	Percent
1999-01-01	9.7
1999-04-01	9.0
1999-07-01	9.3
1999-10-01	9.6
2000-01-01	10
2000-04-01	9.2
2000-07-01	7.9
2000-10-01	7.7
2001-01-01	6.0
2001-04-01	5.6
2001-07-01	5.3
2001-10-01	5.7
2002-01-01	6.2
2002-04-01	5.8
2002-07-01	6.2
2002-10-01	6.3
2003-01-01	6.2
2003-04-01	5.8
2003-07-01	6.5
2003-10-01	5.9
2004-01-01	6.0
2004-04-01	6.2
2004-07-01	6.0
2004-10-01	6.5
2005-01-01	5.9
2005-04-01	6.5
2005-07-01	4.9
2005-10-01	5.5
2006-01-01	5.5
2006-04-01	5.0
2006-07-01	4.7
2006-10-01	4.6
2007-01-01	4.8
2007-04-01	4.9
2007-07-01	4.9
2007-10-01	5.4
2008-01-01	5.6
2008-04-01	6.2
2008-07-01	6.4
2008-10-01	7.6
2009-01-01	10
2009-04-01	11.4
2009-07-01	11.5
2009-10-01	12.5
2010-01-01	13.5
2010-04-01	14.4
2010-07-01	14.5
2010-10-01	15.2
2011-01-01	14.5
2011-04-01	14.7
2011-07-01	15.3
2011-10-01	17
2012-01-01	17.7
2012-04-01	17.6
2012-07-01	18
2012-10-01	19
2013-01-01	20.3
2013-04-01	20.2
2013-07-01	20.2
2013-10-01	20.4
2014-01-01	21
2014-04-01	20.2
2014-07-01	19.9
2014-10-01	20.6
2015-01-01	19.6
2015-04-01	18.4
2015-07-01	17.8
2015-10-01	18.3
2016-01-01	17.7
2016-04-01	16.9
2016-07-01	16.2
2016-10-01	16.6
2017-01-01	16.3
2017-04-01	14.8
2017-07-01	13.8
2017-10-01	14.5
2018-01-01	14.2
2018-04-01	13.3
2018-07-01	11.5