Quarter	Percent
1999-04-01	9.24544666088465
2000-04-01	8.27923578062191
2001-04-01	7.78820651179806
2002-04-01	8.22423212265572
2003-04-01	9.29196571197156
2004-04-01	10.08852853056180
2005-01-01	10.90000000000000
2005-04-01	10.90000000000000
2005-07-01	11.00000000000000
2005-10-01	10.80000000000000
2006-01-01	10.90000000000000
2006-04-01	10.00000000000000
2006-07-01	9.90000000000000
2006-10-01	9.90000000000000
2007-01-01	9.30000000000000
2007-04-01	8.80000000000000
2007-07-01	8.70000000000000
2007-10-01	8.50000000000000
2008-01-01	8.10000000000000
2008-04-01	8.00000000000000
2008-07-01	7.60000000000000
2008-10-01	7.00000000000000
2009-01-01	7.60000000000000
2009-04-01	7.30000000000000
2009-07-01	7.60000000000000
2009-10-01	6.80000000000000
2010-01-01	7.20000000000000
2010-04-01	6.40000000000000
2010-07-01	6.30000000000000
2010-10-01	6.20000000000000
2011-01-01	6.10000000000000
2011-04-01	5.40000000000000
2011-07-01	5.60000000000000
2011-10-01	5.30000000000000
2012-01-01	5.30000000000000
2012-04-01	5.10000000000000
2012-07-01	5.20000000000000
2012-10-01	5.10000000000000
2013-01-01	5.20000000000000
2013-04-01	4.90000000000000
2013-07-01	4.80000000000000
2013-10-01	4.80000000000000
2014-01-01	4.90000000000000
2014-04-01	4.50000000000000
2014-07-01	4.60000000000000
2014-10-01	4.50000000000000
2015-01-01	4.50000000000000
2015-04-01	4.20000000000000
2015-07-01	4.00000000000000
2015-10-01	4.30000000000000
2016-01-01	4.20000000000000
2016-04-01	3.80000000000000
2016-07-01	3.70000000000000
2016-10-01	3.30000000000000
2017-01-01	3.60000000000000
2017-04-01	3.20000000000000
2017-07-01	3.30000000000000
2017-10-01	3.20000000000000
2018-01-01	3.00000000000000
2018-04-01	3.00000000000000