Month	Percent
1975-01-31	12.41
1975-02-28	11.31
1975-03-31	10
1975-04-30	10.06
1975-05-31	9.59
1975-06-30	9.56
1975-07-31	10.38
1975-08-31	10.28
1975-09-30	10.38
1975-10-31	11.34
1975-11-30	11.19
1975-12-31	10.72
1976-01-31	9.81
1976-02-29	8.69
1976-03-31	8.16
1976-04-30	9.81
1976-05-31	11.19
1976-06-30	11.09
1976-07-31	11.02
1976-08-31	10.75
1976-09-30	12.88
1976-10-31	15.03
1976-11-30	14.97
1976-12-31	14.75
1977-01-31	12.91
1977-02-28	11.56
1977-03-31	9.25
1977-04-30	8
1977-05-31	7.69
1977-06-30	7.34
1977-07-31	7.25
1977-08-31	6.61
1977-09-30	5.75
1977-10-31	4.77
1977-11-30	6.38
1977-12-31	6.69
1978-01-31	6.19
1978-02-28	6.22
1978-03-31	6.22
1978-04-30	7.38
1978-05-31	8.5
1978-06-30	9.78
1978-07-31	9.69
1978-08-31	9.17
1978-09-30	9.16
1978-10-31	10.31
1978-11-30	12.11
1978-12-31	11.88
1979-01-31	12.22
1979-02-28	13.09
1979-03-31	12.75
1979-04-30	11.97
1979-05-31	11.88
1979-06-30	14.25
1979-07-31	14.25
1979-08-31	14.25
1979-09-30	14.2
1979-10-31	14.22
1979-11-30	16.12
1979-12-31	17.28
1980-01-31	17.94
1980-02-29	17.97
1980-03-31	18.09
1980-04-30	17.31
1980-05-31	17.19
1980-06-30	17.28
1980-07-31	16.41
1980-08-31	16.53
1980-09-30	16.13
1980-10-31	16.94
1980-11-30	14.06
1980-12-31	14.5
1981-01-31	13.63
1981-02-28	13.28
1981-03-31	11.72
1981-04-30	11.72
1981-05-31	11.75
1981-06-30	11.59
1981-07-31	13.78
1981-08-31	12.81
1981-09-30	15.75
1981-10-31	15.59
1981-11-30	14.72
1981-12-31	14.63
1982-01-31	13.92
1982-02-28	13.66
1982-03-31	13.13
1982-04-30	13.06
1982-05-31	12.88
1982-06-30	12.53
1982-07-31	11.53
1982-08-31	10.56
1982-09-30	10.13
1982-10-31	9.59
1982-11-30	10.13
1982-12-31	10.06
1983-01-31	11.09
1983-02-28	11.03
1983-03-31	10.53
1983-04-30	10.06
1983-05-31	10.06
1983-06-30	9.52
1983-07-31	9.5
1983-08-31	9.53
1983-09-30	9.44
1983-10-31	9.03
1983-11-30	8.98
1983-12-31	8.98
1984-01-31	9
1984-02-29	9
1984-03-31	8.53
1984-04-30	8.5
1984-05-31	9.25
1984-06-30	8.81
1984-07-31	11.91
1984-08-31	10.47
1984-09-30	10.38
1984-10-31	10.38
1984-11-30	9.38
1984-12-31	9.38
1985-01-31	12.88
1985-02-28	13.75
1985-03-31	12.81
1985-04-30	12.27
1985-05-31	12.27
1985-06-30	12.28
1985-07-31	11.16
1985-08-31	11.5
1985-09-30	11.34
1985-10-31	11.33
1985-11-30	11.33
1985-12-31	11.33
1986-01-31	12.34
1986-02-28	12.32
1986-03-31	11.37
1986-04-30	10.38
1986-05-31	9.82
1986-06-30	9.82
1986-07-31	9.8
1986-08-31	9.81
1986-09-30	10.13
1986-10-31	10.74
1986-11-30	10.82
1986-12-31	10.82
1987-01-31	10.82
1987-02-28	10.83
1987-03-31	9.76
1987-04-30	9.3
1987-05-31	8.83
1987-06-30	8.89
1987-07-31	8.74
1987-08-31	9.68
1987-09-30	10
1987-10-31	9.11
1987-11-30	8.81
1987-12-31	8.39
1988-01-31	8.35
1988-02-29	8.72
1988-03-31	8.33
1988-04-30	7.91
1988-05-31	7.25
1988-06-30	9.1
1988-07-31	10.15
1988-08-31	11.68
1988-09-30	11.65
1988-10-31	11.63
1988-11-30	12.77
1988-12-31	12.68
1989-01-31	12.74
1989-02-28	12.86
1989-03-31	12.62
1989-04-30	12.52
1989-05-31	13.78
1989-06-30	13.6
1989-07-31	13.62
1989-08-31	13.74
1989-09-30	14.22
1989-10-31	14.86
1989-11-30	14.79
1989-12-31	13.74
1990-01-31	14.73
1990-02-28	14.73
1990-03-31	14.68
1990-04-30	14.73
1990-05-31	14.72
1990-06-30	14.65
1990-07-31	14.66
1990-08-31	14.64
1990-09-30	14.61
1990-10-31	13.69
1990-11-30	13.65
1990-12-31	13.73
1991-01-31	13.67
1991-02-28	12.55
1991-03-31	12.1
1991-04-30	11.5
1991-05-31	11.14
1991-06-30	11.16
1991-07-31	10.79
1991-08-31	10.68
1991-09-30	10.29
1991-10-31	10.24
1991-11-30	10.3
1991-12-31	10.28
1992-01-31	10.23
1992-02-29	10.22
1992-03-31	10.13
1992-04-30	10.3
1992-05-31	9.62
1992-06-30	9.72
1992-07-31	9.72
1992-08-31	9.75
1992-09-30	8.56
1992-10-31	7.65
1992-11-30	6.8
1992-12-31	6.59
1993-01-31	5.74
1993-02-28	5.77
1993-03-31	5.69
1993-04-30	5.72
1993-05-31	5.6
1993-06-30	5.65
1993-07-31	5.74
1993-08-31	5.64
1993-09-30	5.71
1993-10-31	5.63
1993-11-30	5.06
1993-12-31	5.1
1994-01-31	5.18
1994-02-28	4.93
1994-03-31	4.91
1994-04-30	4.85
1994-05-31	4.86
1994-06-30	4.91
1994-07-31	5.07
1994-08-31	4.87
1994-09-30	5.21
1994-10-31	5.35
1994-11-30	5.41
1994-12-31	5.93
1995-01-31	6.36
1995-02-28	6.35
1995-03-31	6.1
1995-04-30	6.49
1995-05-31	6.19
1995-06-30	6.47
1995-07-31	6.6
1995-08-31	6.58
1995-09-30	6.65
1995-10-31	6.56
1995-11-30	6.59
1995-12-31	6.4
1996-01-31	6.11
1996-02-29	6.1
1996-03-31	5.91
1996-04-30	5.91
1996-05-31	5.93
1996-06-30	5.65
1996-07-31	5.66
1996-08-31	5.65
1996-09-30	5.69
1996-10-31	5.9
1996-11-30	5.93
1996-12-31	5.97
1997-01-31	5.94
1997-02-28	5.9
1997-03-31	6.02
1997-04-30	6.13
1997-05-31	6.31
1997-06-30	6.49
1997-07-31	6.8
1997-08-31	6.97
1997-09-30	6.98
1997-10-31	7
1997-11-30	7.25
1997-12-31	7.22
1998-01-31	7.25
1998-02-28	7.28
1998-03-31	7.26
1998-04-30	7.2
1998-05-31	7.21
1998-06-30	7.43
1998-07-31	7.45
1998-08-31	7.41
1998-09-30	7.22
1998-10-31	6.99
1998-11-30	6.53
1998-12-31	5.94
1999-01-31	5.75
1999-02-28	5.35
1999-03-31	5.13
1999-04-30	5.13
1999-05-31	5.14
1999-06-30	4.86
1999-07-31	4.94
1999-08-31	4.83
1999-09-30	5.2
1999-10-31	5.34
1999-11-30	5.37
1999-12-31	5.39
2000-01-31	5.84
2000-02-29	5.98
2000-03-31	5.88
2000-04-30	6.06
2000-05-31	5.97
2000-06-30	5.8
2000-07-31	5.93
2000-08-31	5.93
2000-09-30	5.89
2000-10-31	5.88
2000-11-30	5.79
2000-12-31	5.82
2001-01-31	5.75
2001-02-28	5.57
2001-03-31	5.45
2001-04-30	5.28
2001-05-31	5.14
2001-06-30	5.09
2001-07-31	5.1
2001-08-31	4.73
2001-09-30	4.51
2001-10-31	4.16
2001-11-30	3.92
2001-12-31	3.96
2002-01-31	3.97
2002-02-28	3.93
2002-03-31	3.91
2002-04-30	3.93
2002-05-31	3.96
2002-06-30	3.84
2002-07-31	3.83
2002-08-31	3.89
2002-09-30	3.82
2002-10-31	3.83
2002-11-30	3.92
2002-12-31	3.96
2003-01-31	3.89
2003-02-28	3.65
2003-03-31	3.62
2003-04-30	3.58
2003-05-31	3.61
2003-06-30	3.6
2003-07-31	3.34
2003-08-31	3.52
2003-09-30	3.58
2003-10-31	3.68
2003-11-30	3.74
2003-12-31	3.85
2004-01-31	3.89
2004-02-29	4.05
2004-03-31	4.07
2004-04-30	4.18
2004-05-31	4.38
2004-06-30	4.54
2004-07-31	4.66
2004-08-31	4.75
2004-09-30	4.75
2004-10-31	4.74
2004-11-30	4.74
2004-12-31	4.75
2005-01-31	4.75
2005-02-28	4.8
2005-03-31	4.79
2005-04-30	4.8
2005-05-31	4.79
2005-06-30	4.75
2005-07-31	4.58