Quarter	Percent
1997-03-31	7.18
1997-06-30	7.2
1997-09-30	7.19
1997-12-31	7.335
1998-03-31	7.235
1998-06-30	7.605
1998-09-30	6.475
1998-12-31	5.225
1999-03-31	4.865
1999-06-30	5.06
1999-09-30	5.825
1999-12-31	6.255
2000-03-31	6.445
2000-06-30	6.155
2000-09-30	6.035
2000-12-31	5.525
2001-03-31	5.025
2001-06-30	5.4
2001-09-30	4.275
2001-12-31	4.2
2002-03-31	4.615
2002-06-30	4.525
2002-09-30	3.745
2002-12-31	3.795
2003-03-31	3.365
2003-06-30	3.355
2003-09-30	3.805
2003-12-31	4.245
2004-03-31	4.575
2004-06-30	5.055
2004-09-30	4.895
2004-12-31	4.755
2005-03-31	4.925
2005-06-30	4.415
2005-09-30	4.365
2005-12-31	4.395
2006-03-31	4.595
2006-06-30	4.715
2006-09-30	5.105
2006-12-31	5.41
2007-03-31	5.685
2007-06-30	6.09
2007-09-30	5.605
2007-12-31	5.135
2008-03-31	4.75
2008-06-30	5.495
2008-09-30	4.545
2008-12-31	1.175
2009-03-31	0.835
2009-06-30	0.845
2009-09-30	0.675
2009-12-31	0.785
2010-03-31	0.715
2010-06-30	0.675
2010-09-30	0.615
2010-12-31	0.705
2011-03-31	0.965
2011-06-30	0.685
2011-09-30	0.525
2011-12-31	0.495
2012-03-31	0.49
2012-06-30	0.425
2012-09-30	0.405
2012-12-31	0.425
2013-03-31	0.415