Quarter	Percent
1999-04-01	10.4
1999-07-01	13.3
1999-10-01	11.4
2000-01-01	11.3
2000-04-01	10.4
2000-07-01	12.7
2000-10-01	11.7
2001-01-01	9.8
2001-04-01	8.7
2001-07-01	11.3
2001-10-01	10.9
2002-01-01	9.5
2002-04-01	8.8
2002-07-01	11.7
2002-10-01	10.6
2003-01-01	9.5
2003-04-01	9.5
2003-07-01	12.6
2003-10-01	10.2
2004-01-01	9.4
2004-04-01	9.7
2004-07-01	12.2
2004-10-01	11
2005-01-01	10.1
2005-04-01	9.9
2005-07-01	12
2005-10-01	11.9
2006-01-01	10.5
2006-04-01	11.7
2006-07-01	14
2006-10-01	11.8
2007-01-01	12.1
2007-04-01	12.4
2007-07-01	14
2007-10-01	11.5
2008-01-01	10.9
2008-04-01	11.9
2008-07-01	14.5
2008-10-01	13.8
2009-01-01	14.5
2009-04-01	15.7
2009-07-01	18
2009-10-01	16.2
2010-01-01	16
2010-04-01	16.8
2010-07-01	18.9
2010-10-01	18.6
2011-01-01	17.3
2011-04-01	18
2011-07-01	20.1
2011-10-01	18.6
2012-01-01	17.7
2012-04-01	17.6
2012-07-01	19.3
2012-10-01	18.0
2013-01-01	17.8
2013-04-01	18.1
2013-07-01	19.5
2013-10-01	17.1
2014-01-01	15.8
2014-04-01	13.8
2014-07-01	15.3
2014-10-01	14.3
2015-01-01	13.0
2015-04-01	13.0
2015-07-01	13.8
2015-10-01	11.9
2016-01-01	11.8
2016-04-01	11.1
2016-07-01	11.7
2016-10-01	9.7
2017-01-01	10.1
2017-04-01	10.0
2017-07-01	11.5
2017-10-01	10.6
2018-01-01	10.5
2018-04-01	9.6