Month	Percent
1970-12-01	9.86
1971-01-01	9.82
1971-02-01	9.85
1971-03-01	9.51
1971-04-01	9.40
1971-05-01	9.29
1971-06-01	9.30
1971-07-01	9.36
1971-08-01	9.35
1971-09-01	9.11
1971-10-01	8.78
1971-11-01	8.61
1971-12-01	8.48
1972-01-01	8.37
1972-02-01	8.25
1972-03-01	8.38
1972-04-01	8.30
1972-05-01	8.64
1972-06-01	9.81
1972-07-01	9.76
1972-08-01	9.51
1972-09-01	9.46
1972-10-01	9.45
1972-11-01	9.47
1972-12-01	9.46
1973-01-01	9.56
1973-02-01	9.61
1973-03-01	10.01
1973-04-01	10.00
1973-05-01	10.04
1973-06-01	10.18
1973-07-01	10.76
1973-08-01	11.34
1973-09-01	11.42
1973-10-01	11.44
1973-11-01	11.92
1973-12-01	12.33
1974-01-01	13.24
1974-02-01	13.37
1974-03-01	13.80
1974-04-01	14.04
1974-05-01	13.76
1974-06-01	14.61
1974-07-01	14.48
1974-08-01	14.95
1974-09-01	14.66
1974-10-01	15.32
1974-11-01	16.35
1974-12-01	16.86
1975-01-01	15.20
1975-02-01	14.06
1975-03-01	13.18
1975-04-01	13.88
1975-05-01	13.64
1975-06-01	13.76
1975-07-01	13.16
1975-08-01	13.36
1975-09-01	13.81
1975-10-01	14.47
1975-11-01	14.45
1975-12-01	14.64
1976-01-01	13.77
1976-02-01	13.78
1976-03-01	14.11
1976-04-01	14.23
1976-05-01	14.14
1976-06-01	13.89
1976-07-01	14.14
1976-08-01	14.37
1976-09-01	15.23
1976-10-01	16.37
1976-11-01	15.84
1976-12-01	15.49
1977-01-01	14.09
1977-02-01	14.28
1977-03-01	12.70
1977-04-01	13.14
1977-05-01	13.45
1977-06-01	13.58
1977-07-01	13.86
1977-08-01	13.17
1977-09-01	11.87
1977-10-01	11.24
1977-11-01	11.96
1977-12-01	11.30
1978-01-01	11.68
1978-02-01	12.29
1978-03-01	12.28
1978-04-01	12.89
1978-05-01	13.26
1978-06-01	13.31
1978-07-01	12.62
1978-08-01	12.90
1978-09-01	13.08
1978-10-01	12.92
1978-11-01	13.34
1978-12-01	13.44
1979-01-01	14.35
1979-02-01	13.48
1979-03-01	13.33
1979-04-01	13.46
1979-05-01	13.81
1979-06-01	15.37
1979-07-01	15.99
1979-08-01	15.92
1979-09-01	15.72
1979-10-01	16.64
1979-11-01	16.42
1979-12-01	16.29
1980-01-01	15.95
1980-02-01	16.39
1980-03-01	16.82
1980-04-01	16.20
1980-05-01	15.78
1980-06-01	14.64
1980-07-01	14.08
1980-08-01	14.49
1980-09-01	14.57
1980-10-01	14.77
1980-11-01	14.91
1980-12-01	15.63
1981-01-01	16.13
1981-02-01	15.99
1981-03-01	16.18
1981-04-01	16.60
1981-05-01	16.99
1981-06-01	17.31
1981-07-01	17.44
1981-08-01	17.61
1981-09-01	18.22
1981-10-01	18.24
1981-11-01	18.16
1981-12-01	18.34
1982-01-01	19.11
1982-02-01	19.16
1982-03-01	18.83
1982-04-01	18.28
1982-05-01	18.28
1982-06-01	18.58
1982-07-01	17.33
1982-08-01	15.93
1982-09-01	15.17
1982-10-01	13.95
1982-11-01	15.53
1982-12-01	14.54
1983-01-01	14.98
1983-02-01	14.26
1983-03-01	13.96
1983-04-01	13.62
1983-05-01	13.51
1983-06-01	13.61
1983-07-01	13.81
1983-08-01	13.60
1983-09-01	13.72
1983-10-01	13.82
1983-11-01	13.72
1983-12-01	14.24
1984-01-01	13.94
1984-02-01	14.16
1984-03-01	14.08
1984-04-01	14.14
1984-05-01	14.49
1984-06-01	14.58
1984-07-01	14.89
1984-08-01	14.95
1984-09-01	14.98
1984-10-01	14.99
1984-11-01	15.25
1984-12-01	14.90
1985-01-01	14.85
1985-02-01	14.69
1985-03-01	14.08
1985-04-01	13.26
1985-05-01	13.03
1985-06-01	12.61
1985-07-01	11.81
1985-08-01	11.42
1985-09-01	11.70
1985-10-01	11.66
1985-11-01	12.19
1985-12-01	12.06
1986-01-01	12.29
1986-02-01	11.56
1986-03-01	10.26
1986-04-01	9.29
1986-05-01	9.30
1986-06-01	9.62
1986-07-01	10.00
1986-08-01	10.79
1986-09-01	11.72
1986-10-01	13.68
1986-11-01	13.25
1986-12-01	12.91
1987-01-01	12.53
1987-02-01	12.68
1987-03-01	11.96
1987-04-01	10.87
1987-05-01	10.56
1987-06-01	10.94
1987-07-01	11.08
1987-08-01	11.67
1987-09-01	11.23
1987-10-01	10.81
1987-11-01	10.33
1987-12-01	10.45
1988-01-01	10.30
1988-02-01	10.10
1988-03-01	9.82
1988-04-01	9.54
1988-05-01	9.58
1988-06-01	9.52
1988-07-01	9.41
1988-08-01	9.20
1988-09-01	9.08
1988-10-01	8.59
1988-11-01	8.67
1988-12-01	8.52
1989-01-01	8.46
1989-02-01	9.00
1989-03-01	8.80
1989-04-01	9.14
1989-05-01	9.47
1989-06-01	9.25
1989-07-01	8.64
1989-08-01	9.20
1989-09-01	9.21
1989-10-01	9.59
1989-11-01	9.66
1989-12-01	9.62
1990-01-01	9.70
1990-02-01	10.44
1990-03-01	10.95
1990-04-01	10.39
1990-05-01	10.20
1990-06-01	10.03
1990-07-01	9.68
1990-08-01	10.30
1990-09-01	10.74
1990-10-01	10.47
1990-11-01	10.34
1990-12-01	10.05
1991-01-01	10.05
1991-02-01	9.59
1991-03-01	9.35
1991-04-01	9.34
1991-05-01	9.26
1991-06-01	9.19
1991-07-01	9.40
1991-08-01	9.35
1991-09-01	9.29
1991-10-01	9.22
1991-11-01	9.22
1991-12-01	9.23
1992-01-01	8.86
1992-02-01	8.77
1992-03-01	8.99
1992-04-01	8.95
1992-05-01	8.82
1992-06-01	8.99
1992-07-01	9.22
1992-08-01	9.23
1992-09-01	9.94
1992-10-01	9.54
1992-11-01	10.38
1992-12-01	10.11
1993-01-01	9.68
1993-02-01	9.13
1993-03-01	8.28
1993-04-01	8.10
1993-05-01	7.82
1993-06-01	7.33
1993-07-01	7.31
1993-08-01	6.95
1993-09-01	6.99
1993-10-01	6.59
1993-11-01	6.51
1993-12-01	6.26
1994-01-01	6.14
1994-02-01	6.74
1994-03-01	7.33
1994-04-01	7.67
1994-05-01	8.45
1994-06-01	8.64
1994-07-01	8.44
1994-08-01	8.44
1994-09-01	8.89
1994-10-01	8.62
1994-11-01	8.40
1994-12-01	8.76
1995-01-01	8.67
1995-02-01	8.74
1995-03-01	8.86
1995-04-01	8.66
1995-05-01	8.10
1995-06-01	8.58
1995-07-01	8.32
1995-08-01	8.09
1995-09-01	8.07
1995-10-01	7.85
1995-11-01	7.43
1995-12-01	7.34
1996-01-01	7.21
1996-02-01	7.74
1996-03-01	7.89
1996-04-01	7.35
1996-05-01	7.55
1996-06-01	7.49
1996-07-01	7.52
1996-08-01	7.50
1996-09-01	6.88
1996-10-01	6.83
1996-11-01	6.45
1996-12-01	6.58
1997-01-01	6.54
1997-02-01	6.34
1997-03-01	6.79
1997-04-01	6.62
1997-05-01	6.61
1997-06-01	6.44
1997-07-01	6.21
1997-08-01	6.29
1997-09-01	5.94
1997-10-01	6.03
1997-11-01	5.78
1997-12-01	5.48
1998-01-01	5.29
1998-02-01	5.18
1998-03-01	5.07
1998-04-01	5.16
1998-05-01	5.08
1998-06-01	5.00
1998-07-01	4.87
1998-08-01	4.59
1998-09-01	4.22
1998-10-01	4.35
1998-11-01	4.16
1998-12-01	3.99
1999-01-01	3.84
1999-02-01	4.18
1999-03-01	4.10
1999-04-01	3.89
1999-05-01	4.34
1999-06-01	4.78
1999-07-01	5.06
1999-08-01	5.17
1999-09-01	5.37
1999-10-01	5.44
1999-11-01	5.46
1999-12-01	5.60
2000-01-01	5.78
2000-02-01	5.75
2000-03-01	5.45
2000-04-01	5.52
2000-05-01	5.47
2000-06-01	5.48
2000-07-01	5.46
2000-08-01	5.58
2000-09-01	5.46
2000-10-01	5.48
2000-11-01	5.24
2000-12-01	5.07
2001-01-01	5.02
2001-02-01	4.98
2001-03-01	4.95
2001-04-01	5.27
2001-05-01	5.37
2001-06-01	5.30
2001-07-01	5.07
2001-08-01	4.95
2001-09-01	4.95
2001-10-01	4.53
2001-11-01	4.73
2001-12-01	5.11
2002-01-01	5.21
2002-02-01	5.22
2002-03-01	5.47
2002-04-01	5.37
2002-05-01	5.38
2002-06-01	5.16
2002-07-01	5.01
2002-08-01	4.82
2002-09-01	4.54
2002-10-01	4.74
2002-11-01	4.63
2002-12-01	4.30
2003-01-01	4.16
2003-02-01	3.99
2003-03-01	4.10
2003-04-01	4.15
2003-05-01	3.80
2003-06-01	3.84
2003-07-01	4.19
2003-08-01	4.21
2003-09-01	3.99
2003-10-01	4.32
2003-11-01	4.44
2003-12-01	4.31
2004-01-01	4.27
2004-02-01	4.10
2004-03-01	3.98
2004-04-01	4.23
2004-05-01	4.30
2004-06-01	4.35
2004-07-01	4.22
2004-08-01	4.02
2004-09-01	3.98
2004-10-01	3.87
2004-11-01	3.75
2004-12-01	3.67
2005-01-01	3.48
2005-02-01	3.65
2005-03-01	3.60
2005-04-01	3.38
2005-05-01	3.23
2005-06-01	3.13
2005-07-01	3.21
2005-08-01	3.05
2005-09-01	3.08
2005-10-01	3.33
2005-11-01	3.44
2005-12-01	3.27
2006-01-01	3.46
2006-02-01	3.49
2006-03-01	3.78
2006-04-01	3.97
2006-05-01	3.93
2006-06-01	4.08
2006-07-01	3.91
2006-08-01	3.75
2006-09-01	3.67
2006-10-01	3.78
2006-11-01	3.70
2006-12-01	3.95
2007-01-01	4.12
2007-02-01	3.97
2007-03-01	4.07
2007-04-01	4.20
2007-05-01	4.44
2007-06-01	4.62
2007-07-01	4.45
2007-08-01	4.38
2007-09-01	4.42
2007-10-01	4.40
2007-11-01	4.37
2007-12-01	4.50
2008-01-01	4.21
2008-02-01	4.22
2008-03-01	4.30
2008-04-01	4.59
2008-05-01	4.73
2008-06-01	4.96
2008-07-01	4.78
2008-08-01	4.56
2008-09-01	4.56
2008-10-01	4.55
2008-11-01	4.57
2008-12-01	4.57
2009-01-01	5.70
2009-02-01	5.75
2009-03-01	5.52
2009-04-01	5.27
2009-05-01	5.53
2009-06-01	5.79
2009-07-01	5.04
2009-08-01	4.87
2009-09-01	4.71
2009-10-01	4.76
2009-11-01	4.91
2009-12-01	4.94
2010-01-01	4.83
2010-02-01	4.59
2010-03-01	4.53
2010-04-01	5.20
2010-05-01	4.74
2010-06-01	5.50
2010-07-01	5.04
2010-08-01	5.68
2010-09-01	6.57
2010-10-01	6.92
2010-11-01	9.25
2010-12-01	9.06
2011-01-01	9.15
2011-02-01	9.29
2011-03-01	10.22
2011-04-01	10.47
2011-05-01	11.03
2011-06-01	11.70
2011-07-01	10.85
2011-08-01	8.63
2011-09-01	7.64
2011-10-01	8.15
2011-11-01	9.32
2011-12-01	8.48
2012-01-01	7.29
2012-02-01	7.01
2012-03-01	6.84
2012-04-01	6.82
2012-05-01	7.23
2012-06-01	6.33
2012-07-01	5.98
2012-08-01	5.86
2012-09-01	5.00
2012-10-01	4.66
2012-11-01	4.43
2012-12-01	4.45
2013-01-01	4.06
2013-02-01	3.77
2013-03-01	4.22
2013-04-01	3.52
2013-05-01	3.85
2013-06-01	4.07
2013-07-01	3.88
2013-08-01	4.19
2013-09-01	3.88
2013-10-01	3.50
2013-11-01	3.53
2013-12-01	3.47
2014-01-01	3.31
2014-02-01	3.10
2014-03-01	3.01
2014-04-01	2.82
2014-05-01	2.59
2014-06-01	2.36
2014-07-01	2.21
2014-08-01	1.78
2014-09-01	1.65
2014-10-01	1.71
2014-11-01	1.38
2014-12-01	1.25
2015-01-01	1.16
2015-02-01	0.86
2015-03-01	0.75
2015-04-01	0.93
2015-05-01	1.26
2015-06-01	1.26
2015-07-01	1.18
2015-08-01	1.46
2015-09-01	1.24
2015-10-01	1.11
2015-11-01	1.00
2015-12-01	1.15
2016-01-01	0.96
2016-02-01	0.88
2016-03-01	0.73
2016-04-01	0.96
2016-05-01	0.76
2016-06-01	0.52
2016-07-01	0.43
2016-08-01	0.43
2016-09-01	0.32
2016-10-01	0.64
2016-11-01	0.88
2016-12-01	0.74
2017-01-01	1.16
2017-02-01	0.88
2017-03-01	0.98
2017-04-01	0.84
2017-05-01	0.76
2017-06-01	0.86
2017-07-01	0.83
2017-08-01	0.67
2017-09-01	0.72
2017-10-01	0.57
2017-11-01	0.58
2017-12-01	0.66
2018-01-01	1.13
2018-02-01	1.08
2018-03-01	0.90
2018-04-01	0.96
2018-05-01	0.94
2018-06-01	0.80
2018-07-01	0.90
2018-08-01	0.85
2018-09-01	0.98