Month	Percent
1973-12-01	7.88
1974-01-01	8.38
1974-02-01	8.75
1974-03-01	9.00
1974-04-01	9.00
1974-05-01	9.13
1974-06-01	9.41
1974-07-01	10.00
1974-08-01	11.25
1974-09-01	12.38
1974-10-01	13.75
1974-11-01	12.75
1974-12-01	11.00
1975-01-01	9.75
1975-02-01	9.88
1975-03-01	11.00
1975-04-01	9.25
1975-05-01	8.25
1975-06-01	8.00
1975-07-01	7.00
1975-08-01	7.13
1975-09-01	7.63
1975-10-01	7.25
1975-11-01	7.13
1975-12-01	7.18
1976-01-01	6.25
1976-02-01	7.38
1976-03-01	8.25
1976-04-01	8.13
1976-05-01	7.75
1976-06-01	7.25
1976-07-01	8.40
1976-08-01	8.45
1976-09-01	9.75
1976-10-01	9.63
1976-11-01	9.25
1976-12-01	10.38
1977-01-01	12.00
1977-02-01	13.13
1977-03-01	15.00
1977-04-01	14.50
1977-05-01	14.63
1977-06-01	13.50
1977-07-01	14.30
1977-08-01	15.63
1977-09-01	14.25
1977-10-01	13.75
1977-11-01	12.13
1977-12-01	11.50
1978-01-01	11.50
1978-02-01	12.13
1978-03-01	12.13
1978-04-01	11.50
1978-05-01	11.00
1978-06-01	10.25
1978-07-01	10.00
1978-08-01	10.20
1978-09-01	10.25
1978-10-01	10.50
1978-11-01	10.62
1978-12-01	11.63
1979-01-01	12.38
1979-02-01	12.87
1979-03-01	13.12
1979-04-01	14.25
1979-05-01	14.50
1979-06-01	14.50
1979-07-01	14.93
1979-08-01	14.93
1979-09-01	15.45
1979-10-01	16.07
1979-11-01	16.20
1979-12-01	16.32
1980-01-01	15.82
1980-02-01	15.82
1980-03-01	15.55
1980-04-01	14.92
1980-05-01	14.25
1980-06-01	13.25
1980-07-01	13.27
1980-08-01	13.37
1980-09-01	13.85
1980-10-01	13.95
1980-11-01	14.05
1980-12-01	14.30
1981-01-01	14.22
1981-02-01	14.80
1981-03-01	15.15
1981-04-01	15.02
1981-05-01	14.30
1981-06-01	14.15
1981-07-01	15.25
1981-08-01	15.80
1981-09-01	15.90
1981-10-01	16.40
1981-11-01	16.25
1981-12-01	15.85
1982-01-01	16.62
1982-02-01	17.00
1982-03-01	17.87
1982-04-01	18.00
1982-05-01	16.63
1982-06-01	16.63
1982-07-01	16.63
1982-08-01	16.63
1982-09-01	17.10
1982-10-01	17.42
1982-11-01	17.13
1982-12-01	16.43
1983-01-01	15.35
1983-02-01	14.50
1983-03-01	14.05
1983-04-01	14.45
1983-05-01	15.50
1983-06-01	14.50
1983-07-01	12.75
1983-08-01	11.27
1983-09-01	10.12
1983-10-01	11.12
1983-11-01	11.55
1983-12-01	11.87
1984-01-01	13.50
1984-02-01	13.88
1984-03-01	13.25
1984-04-01	14.10
1984-05-01	14.25
1984-06-01	16.00
1984-07-01	15.38
1984-08-01	15.25
1984-09-01	16.02
1984-10-01	17.60
1984-11-01	15.79
1984-12-01	15.25
1985-01-01	17.31
1985-02-01	20.27
1985-03-01	26.47
1985-04-01	22.07
1985-05-01	24.25
1985-06-01	23.73
1985-07-01	24.02
1985-08-01	26.13
1985-09-01	27.20
1985-10-01	26.57
1985-11-01	22.03
1985-12-01	19.61
1986-01-01	22.26
1986-02-01	23.52
1986-03-01	22.39
1986-04-01	21.54
1986-05-01	17.77
1986-06-01	15.31
1986-07-01	16.45
1986-08-01	16.49
1986-09-01	16.03
1986-10-01	16.28
1986-11-01	18.19
1986-12-01	22.67
1987-01-01	23.51
1987-02-01	25.23
1987-03-01	26.06
1987-04-01	26.35
1987-05-01	22.51
1987-06-01	19.22
1987-07-01	18.46
1987-08-01	18.10
1987-09-01	19.09
1987-10-01	19.77
1987-11-01	18.21
1987-12-01	16.81
1988-01-01	16.97
1988-02-01	16.76
1988-03-01	15.99
1988-04-01	15.90
1988-05-01	16.21
1988-06-01	15.86
1988-07-01	14.99
1988-08-01	14.50
1988-09-01	14.42
1988-10-01	14.26
1988-11-01	14.34
1988-12-01	14.51
1989-01-01	13.80
1989-02-01	13.40
1989-03-01	13.32
1989-04-01	13.34
1989-05-01	13.49
1989-06-01	13.52
1989-07-01	13.40
1989-08-01	12.98
1989-09-01	13.42
1989-10-01	13.85
1989-11-01	13.88
1989-12-01	14.07
1990-01-01	13.90
1990-02-01	13.83
1990-03-01	13.69
1990-04-01	13.59
1990-05-01	13.48
1990-06-01	13.82
1990-07-01	13.74
1990-08-01	14.49
1990-09-01	14.63
1990-10-01	14.53
1990-11-01	13.98
1990-12-01	13.03
1991-01-01	12.37
1991-02-01	11.95
1991-03-01	11.95
1991-04-01	11.35
1991-05-01	10.08
1991-06-01	9.85
1991-07-01	9.65
1991-08-01	9.44
1991-09-01	8.90
1991-10-01	8.04
1991-11-01	8.18
1991-12-01	7.83
1992-01-01	7.43
1992-02-01	7.48
1992-03-01	7.34
1992-04-01	7.07
1992-05-01	6.83
1992-06-01	6.77
1992-07-01	6.18
1992-08-01	6.14
1992-09-01	6.26
1992-10-01	6.23
1992-11-01	6.16
1992-12-01	6.87
1993-01-01	7.87
1993-02-01	7.53
1993-03-01	7.24
1993-04-01	7.15
1993-05-01	6.58
1993-06-01	6.42
1993-07-01	5.70
1993-08-01	5.62
1993-09-01	5.30
1993-10-01	5.45
1993-11-01	5.85
1993-12-01	5.25
1994-01-01	4.66
1994-02-01	4.64
1994-03-01	5.43
1994-04-01	6.39
1994-05-01	5.99
1994-06-01	6.07
1994-07-01	7.08
1994-08-01	7.06
1994-09-01	7.49
1994-10-01	8.01
1994-11-01	8.47
1994-12-01	9.53
1995-01-01	9.29
1995-02-01	9.37
1995-03-01	9.42
1995-04-01	9.23
1995-05-01	9.10
1995-06-01	9.04
1995-07-01	8.84
1995-08-01	9.03
1995-09-01	9.22
1995-10-01	8.69
1995-11-01	8.31
1995-12-01	8.56
1996-01-01	8.61
1996-02-01	8.51
1996-03-01	8.86
1996-04-01	9.22
1996-05-01	9.82
1996-06-01	10.04
1996-07-01	10.12
1996-08-01	9.87
1996-09-01	9.90
1996-10-01	9.61
1996-11-01	8.97
1996-12-01	8.08
1997-01-01	7.55
1997-02-01	7.46
1997-03-01	7.58
1997-04-01	7.49
1997-05-01	7.02
1997-06-01	6.96
1997-07-01	7.79
1997-08-01	8.34
1997-09-01	8.06
1997-10-01	7.76
1997-11-01	7.60
1997-12-01	8.30
1998-01-01	8.89
1998-02-01	8.95
1998-03-01	9.00
1998-04-01	9.26
1998-05-01	8.88
1998-06-01	9.15
1998-07-01	7.75
1998-08-01	6.79
1998-09-01	5.79
1998-10-01	4.85
1998-11-01	4.50
1998-12-01	4.38
1999-01-01	4.47
1999-02-01	4.30
1999-03-01	4.59
1999-04-01	4.64
1999-05-01	4.67
1999-06-01	4.74
1999-07-01	4.72
1999-08-01	4.77
1999-09-01	4.94
1999-10-01	5.10
1999-11-01	5.35
1999-12-01	5.67
2000-01-01	5.68
2000-02-01	5.93
2000-03-01	6.26
2000-04-01	6.49
2000-05-01	6.77
2000-06-01	6.88
2000-07-01	6.83
2000-08-01	6.74
2000-09-01	6.66
2000-10-01	6.65
2000-11-01	6.64
2000-12-01	6.71
2001-01-01	6.53
2001-02-01	6.48
2001-03-01	6.25
2001-04-01	5.97
2001-05-01	5.79
2001-06-01	5.82
2001-07-01	5.79
2001-08-01	5.83
2001-09-01	5.57
2001-10-01	5.15
2001-11-01	4.87
2001-12-01	4.86
2002-01-01	4.86
2002-02-01	4.93
2002-03-01	5.31
2002-04-01	5.68
2002-05-01	5.83
2002-06-01	5.96
2002-07-01	6.00
2002-08-01	5.87
2002-09-01	5.86
2002-10-01	5.88
2002-11-01	5.90
2002-12-01	5.92
2003-01-01	5.86
2003-02-01	5.82
2003-03-01	5.81
2003-04-01	5.73
2003-05-01	5.38
2003-06-01	5.23
2003-07-01	5.11
2003-08-01	5.11
2003-09-01	5.15
2003-10-01	5.19
2003-11-01	5.37
2003-12-01	5.32
2004-01-01	5.35
2004-02-01	5.59
2004-03-01	5.54
2004-04-01	5.59
2004-05-01	5.90
2004-06-01	6.07
2004-07-01	6.25
2004-08-01	6.44
2004-09-01	6.64
2004-10-01	6.75
2004-11-01	6.72
2004-12-01	6.71
2005-01-01	6.76
2005-02-01	6.83
2005-03-01	6.99
2005-04-01	7.05
2005-05-01	7.05
2005-06-01	7.03
2005-07-01	7.03
2005-08-01	7.03
2005-09-01	7.09
2005-10-01	7.28
2005-11-01	7.54
2005-12-01	7.66
2006-01-01	7.64
2006-02-01	7.53
2006-03-01	7.49
2006-04-01	7.47
2006-05-01	7.49
2006-06-01	7.47
2006-07-01	7.48
2006-08-01	7.49
2006-09-01	7.56
2006-10-01	7.66
2006-11-01	7.61
2006-12-01	7.66
2007-01-01	7.70
2007-02-01	7.75
2007-03-01	7.88
2007-04-01	7.98
2007-05-01	8.09
2007-06-01	8.32
2007-07-01	8.44
2007-08-01	8.72
2007-09-01	8.81
2007-10-01	8.68
2007-11-01	8.73
2007-12-01	8.90
2008-01-01	8.75
2008-02-01	8.82
2008-03-01	8.91
2008-04-01	8.87
2008-05-01	8.71
2008-06-01	8.68
2008-07-01	8.46
2008-08-01	8.20
2008-09-01	7.95
2008-10-01	7.43
2008-11-01	6.25
2008-12-01	5.23
2009-01-01	4.38
2009-02-01	3.40
2009-03-01	3.24
2009-04-01	3.12
2009-05-01	2.82
2009-06-01	2.78
2009-07-01	2.79
2009-08-01	2.76
2009-09-01	2.77
2009-10-01	2.79
2009-11-01	2.80
2009-12-01	2.78
2010-01-01	2.78
2010-02-01	2.73
2010-03-01	2.67
2010-04-01	2.69
2010-05-01	2.89
2010-06-01	3.07
2010-07-01	3.23
2010-08-01	3.25
2010-09-01	3.18
2010-10-01	3.18
2010-11-01	3.17
2010-12-01	3.17
2011-01-01	3.19
2011-02-01	3.13
2011-03-01	2.69
2011-04-01	2.65
2011-05-01	2.66
2011-06-01	2.65
2011-07-01	2.71
2011-08-01	2.90
2011-09-01	2.88
2011-10-01	2.76
2011-11-01	2.69
2011-12-01	2.69
2012-01-01	2.74
2012-02-01	2.75
2012-03-01	2.74
2012-04-01	2.74
2012-05-01	2.59
2012-06-01	2.61
2012-07-01	2.67
2012-08-01	2.64
2012-09-01	2.64
2012-10-01	2.65
2012-11-01	2.64
2012-12-01	2.65
2013-01-01	2.66
2013-02-01	2.66
2013-03-01	2.64
2013-04-01	2.65
2013-05-01	2.64
2013-06-01	2.64
2013-07-01	2.64
2013-08-01	2.64
2013-09-01	2.65
2013-10-01	2.67
2013-11-01	2.66
2013-12-01	2.73
2014-01-01	2.88
2014-02-01	2.93
2014-03-01	3.05
2014-04-01	3.24
2014-05-01	3.38
2014-06-01	3.52
2014-07-01	3.67
2014-08-01	3.69
2014-09-01	3.71
2014-10-01	3.68
2014-11-01	3.67
2014-12-01	3.67
2015-01-01	3.67
2015-02-01	3.63
2015-03-01	3.63
2015-04-01	3.63
2015-05-01	3.53
2015-06-01	3.33
2015-07-01	3.13
2015-08-01	2.95
2015-09-01	2.85
2015-10-01	2.86
2015-11-01	2.89
2015-12-01	2.79
2016-01-01	2.73
2016-02-01	2.62
2016-03-01	2.43
2016-04-01	2.34
2016-05-01	2.38
2016-06-01	2.37
2016-07-01	2.37
2016-08-01	2.24
2016-09-01	2.23
2016-10-01	2.15
2016-11-01	2.07
2016-12-01	2.03
2017-01-01	1.98
2017-02-01	2.02
2017-03-01	1.98
2017-04-01	1.97
2017-05-01	1.98
2017-06-01	1.95
2017-07-01	1.96
2017-08-01	1.95
2017-09-01	1.95
2017-10-01	1.94
2017-11-01	1.93
2017-12-01	1.88
2018-01-01	1.88
2018-02-01	1.91
2018-03-01	1.93
2018-04-01	2.01
2018-05-01	2.02
2018-06-01	2.01
2018-07-01	1.94
2018-08-01	1.91
2018-09-01	1.90
2018-10-01	1.89