Month	Percent
1997-05-31	7.199
1997-06-30	7.1976
1997-07-31	7.3011
1997-08-31	7.4603
1997-09-30	7.2482
1997-10-31	7.2091
1997-11-30	7.4213
1997-12-31	7.4026
1998-01-31	7.2286
1998-02-28	7.1253
1998-03-31	7.2027
1998-04-30	7.1018
1998-05-31	7.0671
1998-06-30	7.4123
1998-07-31	7.5211
1998-08-31	7.228
1998-09-30	6.6827
1998-10-31	6.1968
1998-11-30	5.9848
1998-12-31	5.4217
1999-01-31	5.0783
1999-02-28	4.942
1999-03-31	4.962
1999-04-30	4.9583
1999-05-31	5.0382
1999-06-30	5.0255
1999-07-31	5.0775
1999-08-31	5.4279
1999-09-30	5.7032
1999-10-31	5.9843
1999-11-30	5.984
1999-12-31	6.1988
2000-01-31	6.507
2000-02-29	6.4919
2000-03-31	6.4193
2000-04-30	6.4258
2000-05-31	6.366
2000-06-30	6.2252
2000-07-31	6.1183
2000-08-31	6.1411
2000-09-30	6.0943
2000-10-31	5.978
2000-11-30	5.8034
2000-12-31	5.6008
2001-01-31	5.3911
2001-02-28	5.3508
2001-03-31	5.147
2001-04-30	5.0095
2001-05-31	5.0362
2001-06-30	5.2583
2001-07-31	5.2864
2001-08-31	4.8909
2001-09-30	4.5005
2001-10-31	4.2452
2001-11-30	3.8932
2001-12-31	4.0889
2002-01-31	4.3002
2002-02-28	4.3658
2002-03-31	4.562
2002-04-30	4.5698
2002-05-31	4.5873
2002-06-30	4.5722
2002-07-31	4.283
2002-08-31	3.9319
2002-09-30	3.8574
2002-10-31	3.8241
2002-11-30	3.8745
2002-12-31	3.9195
2003-01-31	3.7691
2003-02-28	3.43
2003-03-31	3.3683
2003-04-30	3.4005
2003-05-31	3.3728
2003-06-30	3.3345
2003-07-31	3.308
2003-08-31	3.6735
2003-09-30	3.8505
2003-10-31	4.06
2003-11-30	4.3288
2003-12-31	4.2364
2004-01-31	4.1995
2004-02-29	4.3185
2004-03-31	4.4372
2004-04-30	4.6235
2004-05-31	4.8155
2004-06-30	5.0984
2004-07-31	5.0243
2004-08-31	5.005
2004-09-30	4.9564
2004-10-31	4.8402
2004-11-30	4.7882
2004-12-31	4.7317
2005-01-31	4.713
2005-02-28	4.856
2005-03-31	4.9974
2005-04-30	4.854
2005-05-31	4.6748
2005-06-30	4.5552
2005-07-31	4.3164
2005-08-31	4.3905
2005-09-30	4.3657
2005-10-31	4.4048
2005-11-30	4.508
2005-12-31	4.4903
2006-01-31	4.4324
2006-02-28	4.446
2006-03-31	4.5361
2006-04-30	4.6042
2006-05-31	4.7976
2006-06-30	4.8143
2006-07-31	4.8069
2006-08-31	5.042
2006-09-30	5.1171
2006-10-31	5.2157
2006-11-30	5.2502
2006-12-31	5.3082
2007-01-31	5.6034
2007-02-28	5.6578
2007-03-31	5.587
2007-04-30	5.7418
2007-05-31	5.8752
2007-06-30	6.0629
2007-07-31	6.1686
2007-08-31	5.9839
2007-09-30	5.739
2007-10-31	5.6098
2007-11-30	5.4023
2007-12-31	5.2221
2008-01-31	4.9048
2008-02-29	4.7929
2008-03-31	4.7761
2008-04-30	4.7577
2008-05-31	5.0203
2008-06-30	5.4857
2008-07-31	5.3124
2008-08-31	5.1248
2008-09-30	4.7907
2008-10-31	3.8093
2008-11-30	2.1065
2008-12-31	1.3352
2009-01-31	1.024
2009-02-28	0.855
2009-03-31	0.8084
2009-04-30	0.8875
2009-05-31	0.7745
2009-06-30	0.8277
2009-07-31	0.7339
2009-08-31	0.7235
2009-09-30	0.6091
2009-10-31	0.6798
2009-11-30	0.6902
2009-12-31	0.7021
2010-01-31	0.7768
2010-02-28	0.7163
2010-03-31	0.7093
2010-04-30	0.709
2010-05-31	0.6884
2010-06-30	0.6791
2010-07-31	0.6757
2010-08-31	0.6195
2010-09-30	0.6105
2010-10-31	0.6079
2010-11-30	0.6527
2010-12-31	0.6962
2011-01-31	0.8205
2011-02-28	0.974
2011-03-31	0.9254
2011-04-30	0.9061
2011-05-31	0.7683
2011-06-30	0.7032
2011-07-31	0.6443
2011-08-31	0.573
2011-09-30	0.5486
2011-10-31	0.564
2011-11-30	0.5389
2011-12-31	0.498
2012-01-31	0.481
2012-02-29	0.4688
2012-03-31	0.4839
2012-04-30	0.4871
2012-05-31	0.4634
2012-06-30	0.4011
2012-07-31	0.3777
2012-08-31	0.3541
2012-09-30	0.3885
2012-10-31	0.3835
2012-11-30	0.3973
2012-12-31	0.4213
2013-01-31	0.4395
2013-02-28	0.4138
2013-03-31	0.388