Month	Percent
1978-01-31	6.44
1978-02-28	6.565
1978-03-31	6.375
1978-04-30	7.755
1978-05-31	8.97
1978-06-30	10.005
1978-07-31	10.125
1978-08-31	9.155
1978-09-30	9.125
1978-10-31	10.375
1978-11-30	12.125
1978-12-31	11.94
1979-01-31	12.595
1979-02-28	13.255
1979-03-31	12.655
1979-04-30	12.095
1979-05-31	11.785
1979-06-30	14.255
1979-07-31	14.315
1979-08-31	14.315
1979-09-30	14.035
1979-10-31	14.47
1979-11-30	16.595
1979-12-31	17.095
1980-01-31	17.53
1980-02-29	18.125
1980-03-31	18.285
1980-04-30	17.565
1980-05-31	17.125
1980-06-30	17.75
1980-07-31	16.845
1980-08-31	16.845
1980-09-30	16.345
1980-10-31	17.125
1980-11-30	14.22
1980-12-31	14.845
1981-01-31	14.19
1981-02-28	13.97
1981-03-31	12.595
1981-04-30	12.5
1981-05-31	12.035
1981-06-30	12.005
1981-07-31	14.435
1981-08-31	13.72
1981-09-30	16.405
1981-10-31	16.315
1981-11-30	15.22
1981-12-31	15.405
1982-01-31	14.5
1982-02-28	14.155
1982-03-31	13.565
1982-04-30	13.47
1982-05-31	13.405
1982-06-30	13.03
1982-07-31	11.97
1982-08-31	11.03
1982-09-30	10.875
1982-10-31	10.095
1982-11-30	10.53
1982-12-31	10.66
1983-01-31	11.755
1983-02-28	11.5
1983-03-31	11
1983-04-30	10.445
1983-05-31	10.47
1983-06-30	9.75
1983-07-31	9.755
1983-08-31	9.72
1983-09-30	9.87
1983-10-31	9.255
1983-11-30	9.195
1983-12-31	9.315
1984-01-31	9.405
1984-02-29	9.31
1984-03-31	8.94
1984-04-30	8.755
1984-05-31	8.84
1984-06-30	9
1984-07-31	12.385
1984-08-31	11.03
1984-09-30	10.87
1984-10-31	10.815
1984-11-30	9.875
1984-12-31	9.75
1985-01-31	13.375
1985-02-28	14
1985-03-31	13.75
1985-04-30	12.845
1985-05-31	12.72
1985-06-30	12.75
1985-07-31	11.565
1985-08-31	11.875
1985-09-30	11.69
1985-10-31	11.625
1985-11-30	11.625
1985-12-31	11.69
1986-01-31	12.72
1986-02-28	12.565
1986-03-31	11.875
1986-04-30	10.815
1986-05-31	10
1986-06-30	10.065
1986-07-31	9.97
1986-08-31	10.065
1986-09-30	10.755
1986-10-31	10.94
1986-11-30	11.065
1986-12-31	11.19
1987-01-31	11.095
1987-02-28	11.19
1987-03-31	9.94
1987-04-30	9.565
1987-05-31	8.875
1987-06-30	9.125
1987-07-31	8.845
1987-08-31	9.845
1987-09-30	10.375
1987-10-31	9.065
1987-11-30	8.94
1987-12-31	8.595
1988-01-31	8.5
1988-02-29	8.97
1988-03-31	8.595
1988-04-30	8.16
1988-05-31	7.345
1988-06-30	9.345
1988-07-31	10.47
1988-08-31	12.03
1988-09-30	11.815
1988-10-31	11.94
1988-11-30	12.97
1988-12-31	12.97
1989-01-31	13.095
1989-02-28	13.16
1989-03-31	12.91
1989-04-30	12.69
1989-05-31	14.19
1989-06-30	13.97
1989-07-31	13.845
1989-08-31	13.985
1989-09-30	14.315
1989-10-31	15.28
1989-11-30	15.11
1989-12-31	15.06
1990-01-31	15.0156
1990-02-28	15.015
1990-03-31	14.985
1990-04-30	15.045
1990-05-31	15.095
1990-06-30	14.955
1990-07-31	15.03
1990-08-31	14.985
1990-09-30	14.955
1990-10-31	13.955
1990-11-30	14.11
1990-12-31	14.36
1991-01-31	14.045
1991-02-28	13.22
1991-03-31	12.845
1991-04-30	11.925
1991-05-31	11.545
1991-06-30	11.545
1991-07-31	11.13
1991-08-31	10.955
1991-09-30	10.645
1991-10-31	10.53
1991-11-30	10.61
1991-12-31	10.895
1992-01-31	10.705
1992-02-29	10.515
1992-03-31	10.47
1992-04-30	10.72
1992-05-31	10
1992-06-30	10.13
1992-07-31	10.16
1992-08-31	10.13
1992-09-30	9.22
1992-10-31	8.38
1992-11-30	7.41
1992-12-31	6.91
1993-01-31	6.44
1993-02-28	6.325
1993-03-31	5.925
1993-04-30	5.94
1993-05-31	5.78
1993-06-30	5.955
1993-07-31	5.97
1993-08-31	5.94
1993-09-30	6.095
1993-10-31	5.88
1993-11-30	5.41
1993-12-31	5.36
1994-01-31	5.425
1994-02-28	5.095
1994-03-31	5.11
1994-04-30	5.03
1994-05-31	5.03
1994-06-30	5.015
1994-07-31	5.16
1994-08-31	4.985
1994-09-30	5.345
1994-10-31	5.515
1994-11-30	5.625
1994-12-31	6.03
1995-01-31	6.395
1995-02-28	6.455
1995-03-31	6.5
1995-04-30	6.5
1995-05-31	6.395
1995-06-30	6.56
1995-07-31	6.72
1995-08-31	6.675
1995-09-30	6.735
1995-10-31	6.66
1995-11-30	6.72
1995-12-31	6.485
1996-01-31	6.28
1996-02-29	6.22
1996-03-31	6.015
1996-04-30	6.015
1996-05-31	6.03
1996-06-30	5.735
1996-07-31	5.75
1996-08-31	5.735
1996-09-30	5.845
1996-10-31	6.075
1996-11-30	6.075
1996-12-31	6.175
1997-01-31	6.145
1997-02-28	6.045
1997-03-31	6.095
1997-04-30	6.22
1997-05-31	6.395
1997-06-30	6.575
1997-07-31	6.91
1997-08-31	7.145
1997-09-30	7.11
1997-10-31	7.205
1997-11-30	7.425
1997-12-31	7.47
1998-01-31	7.44
1998-02-28	7.44
1998-03-31	7.485
1998-04-30	7.375
1998-05-31	7.395
1998-06-30	7.5469
1998-07-31	7.545
1998-08-31	7.56
1998-09-30	7.395
1998-10-31	7.345
1998-11-30	6.825
1998-12-31	6.265
1999-01-31	5.895
1999-02-28	5.53
1999-03-31	5.295
1999-04-30	5.265
1999-05-31	5.265
1999-06-30	5.03
1999-07-31	5.145
1999-08-31	5.015
1999-09-30	5.325
1999-10-31	5.36
1999-11-30	5.41
1999-12-31	5.2813
2000-01-31	5.9844
2000-02-29	6.0782
2000-03-31	5.9844
2000-04-30	6.1251
2000-05-31	6.0469
2000-06-30	5.9844
2000-07-31	6.0001
2000-08-31	6
2000-09-30	6.0313
2000-10-31	5.9844
2000-11-30	5.8907
2000-12-31	5.7813
2001-01-31	5.8282
2001-02-28	5.6407
2001-03-31	5.6407
2001-04-30	5.3438
2001-05-31	5.2501
2001-06-30	5.1719
2001-07-31	5.1719
2001-08-31	4.8282
2001-09-30	4.6407
2001-10-31	4.2188
2001-11-30	3.9688
2001-12-31	4.0469
2002-01-31	3.9688
2002-02-28	3.9375
2002-03-31	3.9688
2002-04-30	3.9375
2002-05-31	3.9688
2002-06-30	3.9219
2002-07-31	3.8594
2002-08-31	3.9219
2002-09-30	3.875
2002-10-31	3.8594
2002-11-30	3.93
2002-12-31	3.97
2003-01-31	3.9
2003-02-28	3.66
2003-03-31	3.63
2003-04-30	3.59
2003-05-31	3.625
2003-06-30	3.605
2003-07-31	3.365
2003-08-31	3.52
2003-09-30	3.625
2003-10-31	3.69
2003-11-30	3.725
2003-12-31	3.865
2004-01-31	3.905
2004-02-29	4.04
2004-03-31	4.13
2004-04-30	4.18
2004-05-31	4.38
2004-06-30	4.555
2004-07-31	4.7
2004-08-31	4.79
2004-09-30	4.78
2004-10-31	4.76
2004-11-30	4.765
2004-12-31	4.795
2005-01-31	4.76
2005-02-28	4.8
2005-03-31	4.815
2005-04-30	4.81
2005-05-31	4.79
2005-06-30	4.755
2005-07-31	4.58
2005-08-31	4.525
2005-09-30	4.54
2005-10-31	4.525
2005-11-30	4.535
2005-12-31	4.605
2006-01-31	4.525
2006-02-28	4.505
2006-03-31	4.525
2006-04-30	4.565
2006-05-31	4.61
2006-06-30	4.64
2006-07-31	4.63
2006-08-31	4.875
2006-09-30	4.915
2006-10-31	5.02
2006-11-30	5.11
2006-12-31	5.22
2007-01-31	5.39
2007-02-28	5.385
2007-03-31	5.425
2007-04-30	5.525
2007-05-31	5.63
2007-06-30	5.825
2007-07-31	5.865
2007-08-31	6.5
2007-09-30	6.08
2007-10-31	5.975
2007-11-30	6.055
2007-12-31	5.925
2008-01-31	5.535
2008-02-29	5.555
2008-03-31	5.75
2008-04-30	5.445
2008-05-31	5.415
2008-06-30	5.465
2008-07-31	5.355
2008-08-31	5.335
2008-09-30	6.05
2008-10-31	5.625
2008-11-30	3.15
2008-12-31	2.15
2009-01-31	1.6
2009-02-28	1.4
2009-03-31	1
2009-04-30	0.775
2009-05-31	0.625
2009-06-30	0.6
2009-07-31	0.575
2009-08-31	0.55
2009-09-30	0.525
2009-10-31	0.525
2009-11-30	0.535
2009-12-31	0.53
2010-01-31	0.525
2010-02-28	0.525
2010-03-31	0.525
2010-04-30	0.525
2010-05-31	0.575
2010-06-30	0.575
2010-07-31	0.575
2010-08-31	0.575
2010-09-30	0.575
2010-10-31	0.6
2010-11-30	0.59
2010-12-31	0.615
2011-01-31	0.625
2011-02-28	0.625
2011-03-31	0.625
2011-04-30	0.625
2011-05-31	0.625
2011-06-30	0.66
2011-07-31	0.66
2011-08-31	0.7
2011-09-30	0.715
2011-10-31	0.745
2011-11-30	0.785
2011-12-31	0.81
2012-01-31	0.81
2012-02-29	0.775
2012-03-31	0.73
2012-04-30	0.675
2012-05-31	0.65
2012-06-30	0.6
2012-07-31	0.58
2012-08-31	0.51
2012-09-30	0.475
2012-10-31	0.49
2012-11-30	0.47
2012-12-31	0.47
2013-01-31	0.465
2013-02-28	0.465
2013-03-31	0.455
2013-04-30	0.46
2013-05-31	0.46
2013-06-30	0.46
2013-07-31	0.46
2013-08-31	0.46
2013-09-30	0.48
2013-10-31	0.48
2013-11-30	0.53
2013-12-31	0.475
2014-01-31	0.47
2014-02-28	0.47
2014-03-31	0.47
2014-04-30	0.47
2014-05-31	0.475
2014-06-30	0.475
2014-07-31	0.465
2014-08-31	0.465
2014-09-30	0.465
2014-10-31	0.465
2014-11-30	0.465
2014-12-31	0.465
2015-01-31	0.475
2015-02-28	0.475
2015-03-31	0.475
2015-04-30	0.475
2015-05-31	0.475
2015-06-30	0.505
2015-07-31	0.505
2015-08-31	0.505
2015-09-30	0.505
2015-10-31	0.505
2015-11-30	0.505
2015-12-31	0.505
2016-01-31	0.49
2016-02-29	0.49
2016-03-31	0.49
2016-04-30	0.49
2016-05-31	0.49
2016-06-30	0.49
2016-07-31	0.455
2016-08-31	0.3
2016-09-30	0.31
2016-10-31	0.31
2016-11-30	0.31
2016-12-31	0.3
2017-01-31	0.3
2017-02-28	0.3
2017-03-31	0.28
2017-04-30	0.28
2017-05-31	0.28
2017-06-30	0.28
2017-07-31	0.28
2017-08-31	0.29
2017-09-30	0.29
2017-10-31	0.4
2017-11-30	0.41