Quarter	Percent
2005-01-01	10.260
2005-10-01	11.200
2006-01-01	10.450
2006-07-01	10.280
2007-01-01	9.750
2007-07-01	9.110
2008-01-01	8.460
2008-07-01	8.390
2009-01-01	8.140
2009-07-01	7.871
2010-01-01	7.410
2010-07-01	7.100
2011-01-01	6.800
2011-07-01	6.560
2012-01-01	6.320
2012-07-01	6.130
2013-01-01	5.880
2013-07-01	6.170
2014-01-01	5.700
2014-07-01	5.940
2015-01-01	5.810
2015-07-01	6.180