Quarter	Percent
2002-04-01	2.20
2003-01-01	3.00
2003-04-01	2.00
2003-07-01	2.10
2003-10-01	2.30
2004-01-01	2.00
2004-04-01	2.20
2005-01-01	2.00
2005-10-01	2.10
2006-04-01	2.10
2007-04-01	1.60
2008-01-01	1.80
2008-07-01	1.90
2008-10-01	3.70
2009-01-01	8.80
2009-04-01	7.80
2009-07-01	5.30
2009-10-01	6.80
2010-01-01	7.70
2010-04-01	6.40
2010-07-01	5.50
2010-10-01	8.30
2011-01-01	7.70
2011-04-01	6.60
2011-07-01	4.10
2011-10-01	4.10
2012-01-01	5.70
2012-04-01	5.20
2012-07-01	4.20
2012-10-01	3.60
2013-01-01	4.80
2013-04-01	4.60
2013-07-01	4.30
2013-10-01	3.80
2014-01-01	5.20
2014-04-01	3.90
2014-07-01	2.80
2014-10-01	3.00
2015-01-01	3.00
2015-04-01	2.60
2015-07-01	2.40
2015-10-01	2.40
2016-01-01	3.20
2016-04-01	2.10
2016-07-01	2.00
2016-10-01	1.70
2017-01-01	1.90
2017-04-01	1.80
2017-07-01	1.08
2017-10-01	2.20
2018-01-01	2.70
2018-04-01	2.60