Month	Percent
1960-01-01	5.32
1960-02-01	5.31
1960-03-01	5.23
1960-04-01	5.26
1960-05-01	5.28
1960-06-01	5.29
1960-07-01	5.79
1960-08-01	5.74
1960-09-01	5.71
1960-10-01	5.73
1960-11-01	5.85
1960-12-01	6.07
1961-01-01	6.00
1961-02-01	6.00
1961-03-01	5.90
1961-04-01	5.94
1961-05-01	5.90
1961-06-01	5.93
1961-07-01	5.89
1961-08-01	5.85
1961-09-01	5.81
1961-10-01	5.79
1961-11-01	5.71
1961-12-01	5.74
1962-01-01	5.58
1962-02-01	5.47
1962-03-01	5.37
1962-04-01	5.28
1962-05-01	5.20
1962-06-01	5.21
1962-07-01	5.06
1962-08-01	4.96
1962-09-01	4.95
1962-10-01	5.01
1962-11-01	5.08
1962-12-01	4.96
1963-01-01	4.71
1963-02-01	4.64
1963-03-01	4.90
1963-04-01	4.91
1963-05-01	4.94
1963-06-01	5.03
1963-07-01	5.03
1963-08-01	5.56
1963-09-01	5.82
1963-10-01	5.89
1963-11-01	5.98
1963-12-01	5.98
1964-01-01	6.38
1964-02-01	6.47
1964-03-01	6.42
1964-04-01	6.45
1964-05-01	6.45
1964-06-01	6.42
1964-07-01	6.54
1964-08-01	6.44
1964-09-01	6.45
1964-10-01	6.48
1964-11-01	6.49
1964-12-01	6.43
1965-01-01	6.46
1965-02-01	6.40
1965-03-01	6.39
1965-04-01	6.44
1965-05-01	6.45
1965-06-01	6.49
1965-07-01	6.34
1965-08-01	6.39
1965-09-01	6.45
1965-10-01	6.50
1965-11-01	6.50
1965-12-01	6.45
1966-01-01	6.50
1966-02-01	6.53
1966-03-01	6.54
1966-04-01	6.59
1966-05-01	6.64
1966-06-01	6.68
1966-07-01	6.69
1966-08-01	6.73
1966-09-01	6.76
1966-10-01	6.67
1966-11-01	6.73
1966-12-01	6.76
1967-01-01	6.75
1967-02-01	6.76
1967-03-01	6.76
1967-04-01	6.77
1967-05-01	6.77
1967-06-01	6.77
1967-07-01	6.64
1967-08-01	6.64
1967-09-01	6.66
1967-10-01	6.57
1967-11-01	6.54
1967-12-01	6.58
1968-01-01	6.60
1968-02-01	6.51
1968-03-01	6.51
1968-04-01	6.47
1968-05-01	6.44
1968-06-01	6.52
1968-07-01	6.45
1968-08-01	6.59
1968-09-01	6.58
1968-10-01	6.59
1968-11-01	6.63
1968-12-01	6.65
1969-01-01	6.71
1969-02-01	6.76
1969-03-01	6.84
1969-04-01	7.06
1969-05-01	7.19
1969-06-01	7.16
1969-07-01	7.22
1969-08-01	7.37
1969-09-01	7.86
1969-10-01	7.82
1969-11-01	7.73
1969-12-01	7.80
1970-01-01	7.82
1970-02-01	7.65
1970-03-01	7.64
1970-04-01	7.78
1970-05-01	7.77
1970-06-01	7.83
1970-07-01	7.76
1970-08-01	8.01
1970-09-01	8.05
1970-10-01	7.83
1970-11-01	7.72
1970-12-01	7.79
1971-01-01	7.72
1971-02-01	7.42
1971-03-01	7.37
1971-04-01	7.41
1971-05-01	7.35
1971-06-01	7.28
1971-07-01	7.32
1971-08-01	7.15
1971-09-01	7.29
1971-10-01	7.21
1971-11-01	7.17
1971-12-01	7.17
1972-01-01	7.18
1972-02-01	7.01
1972-03-01	6.84
1972-04-01	7.07
1972-05-01	7.07
1972-06-01	7.07
1972-07-01	6.96
1972-08-01	6.93
1972-09-01	6.95
1972-10-01	7.06
1972-11-01	7.18
1972-12-01	7.21
1973-01-01	7.33
1973-02-01	7.28
1973-03-01	7.33
1973-04-01	7.34
1973-05-01	7.29
1973-06-01	7.21
1973-07-01	7.45
1973-08-01	7.71
1973-09-01	7.62
1973-10-01	7.66
1973-11-01	7.79
1973-12-01	7.92
1974-01-01	8.14
1974-02-01	8.22
1974-03-01	8.36
1974-04-01	8.71
1974-05-01	8.78
1974-06-01	8.86
1974-07-01	8.82
1974-08-01	9.26
1974-09-01	9.12
1974-10-01	8.92
1974-11-01	9.00
1974-12-01	9.03
1975-01-01	9.24
1975-02-01	8.79
1975-03-01	8.71
1975-04-01	8.42
1975-05-01	8.09
1975-06-01	8.07
1975-07-01	8.21
1975-08-01	8.41
1975-09-01	8.50
1975-10-01	8.50
1975-11-01	8.53
1975-12-01	8.72
1976-01-01	8.80
1976-02-01	8.96
1976-03-01	9.00
1976-04-01	9.19
1976-05-01	9.35
1976-06-01	8.94
1976-07-01	8.81
1976-08-01	9.21
1976-09-01	9.11
1976-10-01	9.17
1976-11-01	9.30
1976-12-01	9.22
1977-01-01	9.24
1977-02-01	9.08
1977-03-01	9.06
1977-04-01	8.94
1977-05-01	8.93
1977-06-01	8.61
1977-07-01	8.62
1977-08-01	8.68
1977-09-01	8.42
1977-10-01	8.39
1977-11-01	8.42
1977-12-01	8.76
1978-01-01	9.37
1978-02-01	9.08
1978-03-01	9.07
1978-04-01	8.73
1978-05-01	8.73
1978-06-01	8.73
1978-07-01	8.70
1978-08-01	8.88
1978-09-01	8.91
1978-10-01	8.95
1978-11-01	8.98
1978-12-01	9.00
1979-01-01	9.20
1979-02-01	9.09
1979-03-01	9.02
1979-04-01	9.05
1979-05-01	9.22
1979-06-01	9.40
1979-07-01	9.75
1979-08-01	9.82
1979-09-01	9.94
1979-10-01	10.26
1979-11-01	10.73
1979-12-01	10.84
1980-01-01	11.06
1980-02-01	11.42
1980-03-01	12.28
1980-04-01	12.11
1980-05-01	11.86
1980-06-01	11.95
1980-07-01	11.53
1980-08-01	11.72
1980-09-01	12.05
1980-10-01	12.24
1980-11-01	12.23
1980-12-01	12.35
1981-01-01	12.77
1981-02-01	13.00
1981-03-01	13.11
1981-04-01	13.21
1981-05-01	13.21
1981-06-01	13.72
1981-07-01	13.71
1981-08-01	13.72
1981-09-01	13.70
1981-10-01	13.68
1981-11-01	13.63
1981-12-01	13.78
1982-01-01	13.88
1982-02-01	13.81
1982-03-01	13.75
1982-04-01	13.70
1982-05-01	13.58
1982-06-01	13.61
1982-07-01	13.37
1982-08-01	13.33
1982-09-01	13.29
1982-10-01	13.32
1982-11-01	12.96
1982-12-01	12.54
1983-01-01	12.42
1983-02-01	12.37
1983-03-01	12.53
1983-04-01	12.02
1983-05-01	11.70
1983-06-01	11.67
1983-07-01	11.51
1983-08-01	11.50
1983-09-01	11.77
1983-10-01	11.75
1983-11-01	11.87
1983-12-01	12.18
1984-01-01	12.29
1984-02-01	12.41
1984-03-01	12.55
1984-04-01	12.39
1984-05-01	12.39
1984-06-01	12.40
1984-07-01	12.33
1984-08-01	12.16
1984-09-01	12.12
1984-10-01	12.13
1984-11-01	11.90
1984-12-01	11.84
1985-01-01	11.75
1985-02-01	11.73
1985-03-01	11.73
1985-04-01	11.64
1985-05-01	11.45
1985-06-01	10.78
1985-07-01	10.67
1985-08-01	10.80
1985-09-01	10.76
1985-10-01	10.38
1985-11-01	9.99
1985-12-01	9.94
1986-01-01	10.05
1986-02-01	9.99
1986-03-01	9.48
1986-04-01	8.29
1986-05-01	8.48
1986-06-01	8.58
1986-07-01	8.23
1986-08-01	7.92
1986-09-01	8.04
1986-10-01	8.09
1986-11-01	8.09
1986-12-01	8.27
1987-01-01	8.26
1987-02-01	8.20
1987-03-01	8.11
1987-04-01	8.02
1987-05-01	8.05
1987-06-01	8.10
1987-07-01	8.07
1987-08-01	7.96
1987-09-01	8.18
1987-10-01	8.64
1987-11-01	8.35
1987-12-01	8.27
1988-01-01	8.16
1988-02-01	7.78
1988-03-01	7.67
1988-04-01	7.79
1988-05-01	7.93
1988-06-01	7.95
1988-07-01	8.09
1988-08-01	8.20
1988-09-01	8.24
1988-10-01	8.09
1988-11-01	8.05
1988-12-01	8.14
1989-01-01	8.17
1989-02-01	8.30
1989-03-01	8.51
1989-04-01	8.42
1989-05-01	8.36
1989-06-01	8.35
1989-07-01	8.39
1989-08-01	8.36
1989-09-01	8.43
1989-10-01	8.68
1989-11-01	9.10
1989-12-01	9.40
1990-01-01	9.80
1990-02-01	10.40
1990-03-01	10.26
1990-04-01	10.00
1990-05-01	9.82
1990-06-01	9.75
1990-07-01	9.56
1990-08-01	10.01
1990-09-01	10.30
1990-10-01	10.22
1990-11-01	10.01
1990-12-01	9.95
1991-01-01	9.87
1991-02-01	9.25
1991-03-01	9.23
1991-04-01	9.17
1991-05-01	9.14
1991-06-01	9.26
1991-07-01	9.47
1991-08-01	9.41
1991-09-01	9.22
1991-10-01	9.13
1991-11-01	9.15
1991-12-01	9.13
1992-01-01	8.72
1992-02-01	8.72
1992-03-01	8.81
1992-04-01	8.86
1992-05-01	8.83
1992-06-01	8.92
1992-07-01	8.91
1992-08-01	9.03
1992-09-01	8.77
1992-10-01	8.28
1992-11-01	8.04
1992-12-01	7.95
1993-01-01	7.57
1993-02-01	7.65
1993-03-01	7.37
1993-04-01	7.44
1993-05-01	7.43
1993-06-01	7.23
1993-07-01	7.05
1993-08-01	7.08
1993-09-01	7.22
1993-10-01	7.19
1993-11-01	6.92
1993-12-01	6.59
1994-01-01	6.52
1994-02-01	6.70
1994-03-01	7.14
1994-04-01	7.29
1994-05-01	7.54
1994-06-01	7.98
1994-07-01	7.95
1994-08-01	8.21
1994-09-01	8.58
1994-10-01	8.45
1994-11-01	8.35
1994-12-01	8.30
1995-01-01	8.45
1995-02-01	8.27
1995-03-01	8.16
1995-04-01	7.85
1995-05-01	7.59
1995-06-01	7.33
1995-07-01	7.33
1995-08-01	7.19
1995-09-01	7.04
1995-10-01	7.06
1995-11-01	6.80
1995-12-01	6.70
1996-01-01	6.44
1996-02-01	6.64
1996-03-01	6.84
1996-04-01	6.67
1996-05-01	6.69
1996-06-01	6.78
1996-07-01	6.78
1996-08-01	6.62
1996-09-01	6.45
1996-10-01	6.10
1996-11-01	6.00
1996-12-01	5.90
1997-01-01	5.89
1997-02-01	5.65
1997-03-01	5.85
1997-04-01	6.02
1997-05-01	5.90
1997-06-01	5.83
1997-07-01	5.64
1997-08-01	5.75
1997-09-01	5.69
1997-10-01	5.69
1997-11-01	5.68
1997-12-01	5.45
1998-01-01	5.22
1998-02-01	5.11
1998-03-01	5.03
1998-04-01	5.03
1998-05-01	5.09
1998-06-01	4.96
1998-07-01	4.88
1998-08-01	4.66
1998-09-01	4.34
1998-10-01	4.28
1998-11-01	4.33
1998-12-01	4.09
1999-01-01	3.90
1999-02-01	4.04
1999-03-01	4.26
1999-04-01	4.11
1999-05-01	4.29
1999-06-01	4.64
1999-07-01	4.94
1999-08-01	5.18
1999-09-01	5.34
1999-10-01	5.58
1999-11-01	5.30
1999-12-01	5.41
2000-01-01	5.79
2000-02-01	5.79
2000-03-01	5.62
2000-04-01	5.52
2000-05-01	5.69
2000-06-01	5.53
2000-07-01	5.60
2000-08-01	5.56
2000-09-01	5.63
2000-10-01	5.58
2000-11-01	5.52
2000-12-01	5.28
2001-01-01	5.16
2001-02-01	5.16
2001-03-01	5.08
2001-04-01	5.21
2001-05-01	5.38
2001-06-01	5.33
2001-07-01	5.35
2001-08-01	5.15
2001-09-01	5.14
2001-10-01	4.89
2001-11-01	4.75
2001-12-01	4.97
2002-01-01	5.08
2002-02-01	5.15
2002-03-01	5.37
2002-04-01	5.37
2002-05-01	5.38
2002-06-01	5.24
2002-07-01	5.09
2002-08-01	4.80
2002-09-01	4.60
2002-10-01	4.66
2002-11-01	4.64
2002-12-01	4.46
2003-01-01	4.28
2003-02-01	4.11
2003-03-01	4.15
2003-04-01	4.29
2003-05-01	3.95
2003-06-01	3.74
2003-07-01	4.06
2003-08-01	4.22
2003-09-01	4.25
2003-10-01	4.31
2003-11-01	4.43
2003-12-01	4.38
2004-01-01	4.26
2004-02-01	4.26
2004-03-01	4.07
2004-04-01	4.26
2004-05-01	4.40
2004-06-01	4.46
2004-07-01	4.34
2004-08-01	4.18
2004-09-01	4.11
2004-10-01	3.98
2004-11-01	3.85
2004-12-01	3.66
2005-01-01	3.59
2005-02-01	3.57
2005-03-01	3.76
2005-04-01	3.60
2005-05-01	3.43
2005-06-01	3.26
2005-07-01	3.30
2005-08-01	3.31
2005-09-01	3.14
2005-10-01	3.30
2005-11-01	3.49
2005-12-01	3.39
2006-01-01	3.37
2006-02-01	3.54
2006-03-01	3.70
2006-04-01	3.96
2006-05-01	4.03
2006-06-01	4.02
2006-07-01	4.04
2006-08-01	3.92
2006-09-01	3.79
2006-10-01	3.83
2006-11-01	3.76
2006-12-01	3.82
2007-01-01	4.06
2007-02-01	4.11
2007-03-01	4.01
2007-04-01	4.22
2007-05-01	4.34
2007-06-01	4.64
2007-07-01	4.62
2007-08-01	4.44
2007-09-01	4.39
2007-10-01	4.42
2007-11-01	4.28
2007-12-01	4.41
2008-01-01	4.25
2008-02-01	4.23
2008-03-01	4.23
2008-04-01	4.37
2008-05-01	4.51
2008-06-01	4.84
2008-07-01	4.85
2008-08-01	4.58
2008-09-01	4.56
2008-10-01	4.46
2008-11-01	4.26
2008-12-01	3.87
2009-01-01	4.13
2009-02-01	4.24
2009-03-01	4.03
2009-04-01	3.93
2009-05-01	4.03
2009-06-01	4.12
2009-07-01	3.92
2009-08-01	3.77
2009-09-01	3.72
2009-10-01	3.68
2009-11-01	3.64
2009-12-01	3.61
2010-01-01	3.75
2010-02-01	3.73
2010-03-01	3.63
2010-04-01	3.54
2010-05-01	3.31
2010-06-01	3.47
2010-07-01	3.29
2010-08-01	3.03
2010-09-01	3.12
2010-10-01	3.21
2010-11-01	3.48
2010-12-01	3.99
2011-01-01	4.14
2011-02-01	4.21
2011-03-01	4.21
2011-04-01	4.29
2011-05-01	4.21
2011-06-01	4.14
2011-07-01	4.22
2011-08-01	4.11
2011-09-01	3.88
2011-10-01	4.20
2011-11-01	4.84
2011-12-01	4.35
2012-01-01	4.11
2012-02-01	3.70
2012-03-01	3.53
2012-04-01	3.52
2012-05-01	3.30
2012-06-01	3.17
2012-07-01	2.69
2012-08-01	2.54
2012-09-01	2.61
2012-10-01	2.44
2012-11-01	2.29
2012-12-01	2.10
2013-01-01	2.31
2013-02-01	2.46
2013-03-01	2.25
2013-04-01	2.04
2013-05-01	2.06
2013-06-01	2.44
2013-07-01	2.54
2013-08-01	2.65
2013-09-01	2.75
2013-10-01	2.57
2013-11-01	2.42
2013-12-01	2.43
2014-01-01	2.45
2014-02-01	2.40
2014-03-01	2.26
2014-04-01	2.16
2014-05-01	1.99
2014-06-01	1.83
2014-07-01	1.61
2014-08-01	1.40
2014-09-01	1.30
2014-10-01	1.18
2014-11-01	1.07
2014-12-01	0.91
2015-01-01	0.73
2015-02-01	0.63
2015-03-01	0.49
2015-04-01	0.42
2015-05-01	0.86
2015-06-01	1.21
2015-07-01	1.15
2015-08-01	1.00
2015-09-01	1.01
2015-10-01	0.85
2015-11-01	0.84
2015-12-01	0.89
2016-01-01	0.86
2016-02-01	0.72
2016-03-01	0.62
2016-04-01	0.55
2016-05-01	0.55
2016-06-01	0.43
2016-07-01	0.20
2016-08-01	0.15
2016-09-01	0.18
2016-10-01	0.27
2016-11-01	0.57
2016-12-01	0.61
2017-01-01	0.70
2017-02-01	0.87
2017-03-01	0.87
2017-04-01	0.78
2017-05-01	0.77
2017-06-01	0.62
2017-07-01	0.83
2017-08-01	0.73
2017-09-01	0.70
2017-10-01	0.69
2017-11-01	0.58
2017-12-01	0.53
2018-01-01	0.70
2018-02-01	0.97
2018-03-01	0.87
2018-04-01	0.81
2018-05-01	0.83
2018-06-01	0.79
2018-07-01	0.68
2018-08-01	0.71
2018-09-01	0.77
2018-10-01	0.85