Monthly 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