Quarter	Percent
1999-04-01	8.7
1999-07-01	9.0
1999-10-01	8.3
2000-01-01	6.9
2000-04-01	6.2
2000-07-01	7.5
2000-10-01	6.6
2001-01-01	6.1
2001-04-01	6.5
2001-07-01	8.8
2001-10-01	8.1
2002-01-01	8.6
2002-04-01	8.8
2002-07-01	9.8
2002-10-01	9.4
2003-01-01	9.5
2003-04-01	9.0
2003-07-01	10.9
2003-10-01	9.6
2004-01-01	8.3
2004-04-01	8.9
2004-07-01	10.3
2004-10-01	9.5
2005-01-01	8.3
2005-04-01	9.1
2005-07-01	9.6
2005-10-01	9.4
2006-01-01	8.7
2006-04-01	8.7
2006-07-01	10.8
2006-10-01	7.5
2007-01-01	9.6
2007-04-01	11.1
2007-07-01	10.4
2007-10-01	9.9
2008-01-01	12.2
2008-04-01	15.3
2008-07-01	17.8
2008-10-01	20.9
2009-01-01	25.8
2009-04-01	32.8
2009-07-01	33.3
2009-10-01	34.5
2010-01-01	33.9
2010-04-01	35.5
2010-07-01	34.3
2010-10-01	35.4
2011-01-01	35.0
2011-04-01	36.9
2011-07-01	36.6
2011-10-01	36.0
2012-01-01	37.9
2012-04-01	40.0
2012-07-01	37.4
2012-10-01	34.4
2013-01-01	31.5
2013-04-01	33.3
2013-07-01	30.2
2013-10-01	26.3
2014-01-01	28.2
2014-04-01	28.1
2014-07-01	26.1
2014-10-01	24.1
2015-01-01	25.0
2015-04-01	24.0
2015-07-01	23.1
2015-10-01	22.2
2016-01-01	20.6
2016-04-01	20.7
2016-07-01	19.9
2016-10-01	17.5
2017-01-01	14.6
2017-04-01	18.5
2017-07-01	16.9
2017-10-01	14.0
2018-01-01	13.2
2018-04-01	16.2