Month	Percent
1997-05-31	7.125
1997-06-30	7.2
1997-07-31	7.525
1997-08-31	7.34
1997-09-30	7.19
1997-10-31	7.18
1997-11-30	7.54
1997-12-31	7.335
1998-01-31	7.16
1998-02-28	7.165
1998-03-31	7.235
1998-04-30	7
1998-05-31	7.105
1998-06-30	7.605
1998-07-31	7.425
1998-08-31	6.975
1998-09-30	6.475
1998-10-31	6.075
1998-11-30	5.905
1998-12-31	5.225
1999-01-31	5.105
1999-02-28	4.915
1999-03-31	4.865
1999-04-30	5.015
1999-05-31	5.035
1999-06-30	5.06
1999-07-31	5.325
1999-08-31	5.405
1999-09-30	5.825
1999-10-31	6.045
1999-11-30	6.145
1999-12-31	6.255
2000-01-31	6.51
2000-02-29	6.475
2000-03-31	6.445
2000-04-30	6.455
2000-05-31	6.315
2000-06-30	6.155
2000-07-31	6.16
2000-08-31	6.195
2000-09-30	6.035
2000-10-31	5.925
2000-11-30	5.715
2000-12-31	5.525
2001-01-31	5.345
2001-02-28	5.245
2001-03-31	5.025
2001-04-30	4.955
2001-05-31	5.105
2001-06-30	5.4
2001-07-31	5.105
2001-08-31	4.855
2001-09-30	4.275
2001-10-31	3.975
2001-11-30	4
2001-12-31	4.2
2002-01-31	4.35
2002-02-28	4.285
2002-03-31	4.615
2002-04-30	4.475
2002-05-31	4.625
2002-06-30	4.525
2002-07-31	4.085
2002-08-31	3.905
2002-09-30	3.745
2002-10-31	3.755
2002-11-30	4.025
2002-12-31	3.795
2003-01-31	3.675
2003-02-28	3.295
2003-03-31	3.365
2003-04-30	3.355
2003-05-31	3.305
2003-06-30	3.355
2003-07-31	3.385
2003-08-31	3.795
2003-09-30	3.805
2003-10-31	4.3
2003-11-30	4.395
2003-12-31	4.245
2004-01-31	4.375
2004-02-29	4.335
2004-03-31	4.575
2004-04-30	4.675
2004-05-31	4.975
2004-06-30	5.055
2004-07-31	5.185
2004-08-31	5.015
2004-09-30	4.895
2004-10-31	4.825
2004-11-30	4.705
2004-12-31	4.755
2005-01-31	4.755
2005-02-28	4.975
2005-03-31	4.925
2005-04-30	4.775
2005-05-31	4.605
2005-06-30	4.415
2005-07-31	4.32
2005-08-31	4.345
2005-09-30	4.365
2005-10-31	4.5
2005-11-30	4.465
2005-12-31	4.395
2006-01-31	4.505
2006-02-28	4.48
2006-03-31	4.595
2006-04-30	4.685
2006-05-31	4.745
2006-06-30	4.715
2006-07-31	4.85
2006-08-31	5.075
2006-09-30	5.105
2006-10-31	5.28
2006-11-30	5.255
2006-12-31	5.41
2007-01-31	5.685
2007-02-28	5.565
2007-03-31	5.685
2007-04-30	5.795
2007-05-31	5.97
2007-06-30	6.09
2007-07-31	6.135
2007-08-31	5.975
2007-09-30	5.605
2007-10-31	5.575
2007-11-30	5.325
2007-12-31	5.135
2008-01-31	4.835
2008-02-29	4.755
2008-03-31	4.75
2008-04-30	4.785
2008-05-31	5.325
2008-06-30	5.495
2008-07-31	5.185
2008-08-31	5.01
2008-09-30	4.545
2008-10-31	3
2008-11-30	1.655
2008-12-31	1.175
2009-01-31	0.995
2009-02-28	0.725
2009-03-31	0.835
2009-04-30	0.825
2009-05-31	0.755
2009-06-30	0.845
2009-07-31	0.735
2009-08-31	0.605
2009-09-30	0.675
2009-10-31	0.725
2009-11-30	0.64
2009-12-31	0.785
2010-01-31	0.74
2010-02-28	0.695
2010-03-31	0.715
2010-04-30	0.755
2010-05-31	0.675
2010-06-30	0.675
2010-07-31	0.645
2010-08-31	0.55
2010-09-30	0.615
2010-10-31	0.61
2010-11-30	0.655
2010-12-31	0.705
2011-01-31	0.815
2011-02-28	0.925
2011-03-31	0.965
2011-04-30	0.795
2011-05-31	0.725
2011-06-30	0.685
2011-07-31	0.615
2011-08-31	0.585
2011-09-30	0.525
2011-10-31	0.575
2011-11-30	0.525
2011-12-31	0.495
2012-01-31	0.485
2012-02-29	0.455
2012-03-31	0.49
2012-04-30	0.495
2012-05-31	0.415
2012-06-30	0.425
2012-07-31	0.315
2012-08-31	0.355
2012-09-30	0.405
2012-10-31	0.385
2012-11-30	0.41
2012-12-31	0.425
2013-01-31	0.435
2013-02-28	0.365
2013-03-31	0.415