Month	Percent
1964-06-01	3.86
1964-07-01	3.87
1964-08-01	3.85
1964-09-01	3.87
1964-10-01	3.94
1964-11-01	3.99
1964-12-01	4.14
1965-01-01	4.13
1965-02-01	4.19
1965-03-01	4.27
1965-04-01	4.28
1965-05-01	4.32
1965-06-01	4.31
1965-07-01	4.29
1965-08-01	4.30
1965-09-01	4.34
1965-10-01	4.46
1965-11-01	4.49
1965-12-01	4.75
1966-01-01	4.95
1966-02-01	5.05
1966-03-01	5.19
1966-04-01	5.26
1966-05-01	5.38
1966-06-01	5.50
1966-07-01	5.62
1966-08-01	5.72
1966-09-01	5.86
1966-10-01	5.83
1966-11-01	5.79
1966-12-01	5.65
1967-01-01	5.40
1967-02-01	5.18
1967-03-01	5.01
1967-04-01	4.43
1967-05-01	4.49
1967-06-01	4.66
1967-07-01	5.00
1967-08-01	4.93
1967-09-01	4.91
1967-10-01	5.22
1967-11-01	5.40
1967-12-01	5.62
1968-01-01	5.48
1968-02-01	5.33
1968-03-01	5.58
1968-04-01	5.78
1968-05-01	6.14
1968-06-01	6.12
1968-07-01	6.03
1968-08-01	5.85
1968-09-01	5.78
1968-10-01	5.90
1968-11-01	6.05
1968-12-01	6.27
1969-01-01	6.50
1969-02-01	6.52
1969-03-01	6.65
1969-04-01	6.84
1969-05-01	7.28
1969-06-01	8.01
1969-07-01	8.69
1969-08-01	8.38
1969-09-01	8.47
1969-10-01	8.56
1969-11-01	8.46
1969-12-01	8.77
1970-01-01	8.91
1970-02-01	8.58
1970-03-01	8.08
1970-04-01	7.51
1970-05-01	8.08
1970-06-01	8.07
1970-07-01	8.01
1970-08-01	7.72
1970-09-01	7.30
1970-10-01	6.76
1970-11-01	6.08
1970-12-01	5.67
1971-01-01	5.09
1971-02-01	4.38
1971-03-01	3.85
1971-04-01	4.45
1971-05-01	4.98
1971-06-01	5.40
1971-07-01	5.75
1971-08-01	5.74
1971-09-01	5.63
1971-10-01	5.27
1971-11-01	4.87
1971-12-01	4.65
1972-01-01	3.95
1972-02-01	3.61
1972-03-01	4.08
1972-04-01	4.60
1972-05-01	4.41
1972-06-01	4.64
1972-07-01	4.82
1972-08-01	4.85
1972-09-01	5.13
1972-10-01	5.25
1972-11-01	5.22
1972-12-01	5.43
1973-01-01	5.81
1973-02-01	6.34
1973-03-01	7.05
1973-04-01	7.31
1973-05-01	7.55
1973-06-01	8.16
1973-07-01	9.70
1973-08-01	10.77
1973-09-01	10.59
1973-10-01	9.20
1973-11-01	9.24
1973-12-01	9.27
1974-01-01	9.00
1974-02-01	8.08
1974-03-01	8.84
1974-04-01	10.25
1974-05-01	11.20
1974-06-01	11.38
1974-07-01	12.25
1974-08-01	12.23
1974-09-01	11.60
1974-10-01	9.78
1974-11-01	9.09
1974-12-01	9.23
1975-01-01	7.48
1975-02-01	6.41
1975-03-01	6.18
1975-04-01	6.26
1975-05-01	5.79
1975-06-01	5.82
1975-07-01	6.55
1975-08-01	6.87
1975-09-01	7.03
1975-10-01	6.56
1975-11-01	6.26
1975-12-01	6.03
1976-01-01	5.14
1976-02-01	5.18
1976-03-01	5.34
1976-04-01	5.12
1976-05-01	5.56
1976-06-01	5.84
1976-07-01	5.52
1976-08-01	5.39
1976-09-01	5.33
1976-10-01	5.12
1976-11-01	5.01
1976-12-01	4.67
1977-01-01	4.83
1977-02-01	4.83
1977-03-01	4.84
1977-04-01	4.80
1977-05-01	5.36
1977-06-01	5.42
1977-07-01	5.46
1977-08-01	5.90
1977-09-01	6.19
1977-10-01	6.67
1977-11-01	6.68
1977-12-01	6.71
1978-01-01	6.94
1978-02-01	6.90
1978-03-01	6.86
1978-04-01	7.03
1978-05-01	7.40
1978-06-01	7.83
1978-07-01	8.12
1978-08-01	8.06
1978-09-01	8.64
1978-10-01	9.44
1978-11-01	10.72
1978-12-01	10.72
1979-01-01	10.51
1979-02-01	10.19
1979-03-01	10.13
1979-04-01	10.06
1979-05-01	10.16
1979-06-01	9.95
1979-07-01	10.11
1979-08-01	10.71
1979-09-01	11.89
1979-10-01	13.66
1979-11-01	13.90
1979-12-01	13.43
1980-01-01	13.39
1980-02-01	14.30
1980-03-01	17.57
1980-04-01	16.14
1980-05-01	9.79
1980-06-01	8.49
1980-07-01	8.65
1980-08-01	9.91
1980-09-01	11.29
1980-10-01	12.94
1980-11-01	15.68
1980-12-01	18.65
1981-01-01	17.19
1981-02-01	16.14
1981-03-01	14.43
1981-04-01	15.08
1981-05-01	18.27
1981-06-01	16.90
1981-07-01	17.76
1981-08-01	17.96
1981-09-01	16.84
1981-10-01	15.39
1981-11-01	12.48
1981-12-01	12.49
1982-01-01	13.51
1982-02-01	15.00
1982-03-01	14.21
1982-04-01	14.44
1982-05-01	13.80
1982-06-01	14.46
1982-07-01	13.44
1982-08-01	10.61
1982-09-01	10.66
1982-10-01	9.51
1982-11-01	8.95
1982-12-01	8.66
1983-01-01	8.36
1983-02-01	8.54
1983-03-01	8.69
1983-04-01	8.63
1983-05-01	8.49
1983-06-01	9.20
1983-07-01	9.50
1983-08-01	9.77
1983-09-01	9.39
1983-10-01	9.18
1983-11-01	9.36
1983-12-01	9.69
1984-01-01	9.42
1984-02-01	9.54
1984-03-01	10.08
1984-04-01	10.41
1984-05-01	11.11
1984-06-01	11.34
1984-07-01	11.56
1984-08-01	11.47
1984-09-01	11.29
1984-10-01	10.38
1984-11-01	9.18
1984-12-01	8.60
1985-01-01	8.14
1985-02-01	8.69
1985-03-01	9.02
1985-04-01	8.49
1985-05-01	7.92
1985-06-01	7.44
1985-07-01	7.64
1985-08-01	7.81
1985-09-01	7.93
1985-10-01	7.88
1985-11-01	7.81
1985-12-01	7.80
1986-01-01	7.82
1986-02-01	7.69
1986-03-01	7.24
1986-04-01	6.60
1986-05-01	6.65
1986-06-01	6.73
1986-07-01	6.37
1986-08-01	5.92
1986-09-01	5.71
1986-10-01	5.69
1986-11-01	5.76
1986-12-01	6.04
1987-01-01	5.87
1987-02-01	6.10
1987-03-01	6.17
1987-04-01	6.52
1987-05-01	6.99
1987-06-01	6.94
1987-07-01	6.70
1987-08-01	6.75
1987-09-01	7.37
1987-10-01	8.02
1987-11-01	7.24
1987-12-01	7.66
1988-01-01	6.92
1988-02-01	6.60
1988-03-01	6.63
1988-04-01	6.92
1988-05-01	7.24
1988-06-01	7.51
1988-07-01	7.94
1988-08-01	8.35
1988-09-01	8.23
1988-10-01	8.36
1988-11-01	8.78
1988-12-01	9.25
1989-01-01	9.20
1989-02-01	9.51
1989-03-01	10.09
1989-04-01	9.94
1989-05-01	9.59
1989-06-01	9.20
1989-07-01	8.76
1989-08-01	8.64
1989-09-01	8.78
1989-10-01	8.60
1989-11-01	8.39
1989-12-01	8.32
1990-01-01	8.16
1990-02-01	8.22
1990-03-01	8.35
1990-04-01	8.42
1990-05-01	8.35
1990-06-01	8.23
1990-07-01	8.10
1990-08-01	7.97
1990-09-01	8.06
1990-10-01	8.06
1990-11-01	8.03
1990-12-01	7.82
1991-01-01	7.17
1991-02-01	6.52
1991-03-01	6.45
1991-04-01	6.06
1991-05-01	5.91
1991-06-01	6.07
1991-07-01	5.98
1991-08-01	5.65
1991-09-01	5.47
1991-10-01	5.33
1991-11-01	4.94
1991-12-01	4.47
1992-01-01	4.05
1992-02-01	4.07
1992-03-01	4.25
1992-04-01	4.00
1992-05-01	3.82
1992-06-01	3.86
1992-07-01	3.37
1992-08-01	3.31
1992-09-01	3.13
1992-10-01	3.26
1992-11-01	3.58
1992-12-01	3.48
1993-01-01	3.19
1993-02-01	3.12
1993-03-01	3.11
1993-04-01	3.09
1993-05-01	3.10
1993-06-01	3.21
1993-07-01	3.16
1993-08-01	3.14
1993-09-01	3.12
1993-10-01	3.24
1993-11-01	3.35
1993-12-01	3.26
1994-01-01	3.15
1994-02-01	3.43
1994-03-01	3.77
1994-04-01	4.01
1994-05-01	4.51
1994-06-01	4.52
1994-07-01	4.73
1994-08-01	4.81
1994-09-01	5.03
1994-10-01	5.51
1994-11-01	5.79
1994-12-01	6.29
1995-01-01	6.24
1995-02-01	6.16
1995-03-01	6.15
1995-04-01	6.11
1995-05-01	6.02
1995-06-01	5.90
1995-07-01	5.77
1995-08-01	5.77
1995-09-01	5.73
1995-10-01	5.79
1995-11-01	5.74
1995-12-01	5.62
1996-01-01	5.39
1996-02-01	5.15
1996-03-01	5.29
1996-04-01	5.36
1996-05-01	5.36
1996-06-01	5.46
1996-07-01	5.53
1996-08-01	5.40
1996-09-01	5.51
1996-10-01	5.41
1996-11-01	5.38
1996-12-01	5.44
1997-01-01	5.43
1997-02-01	5.37
1997-03-01	5.53
1997-04-01	5.71
1997-05-01	5.70
1997-06-01	5.66
1997-07-01	5.60
1997-08-01	5.60
1997-09-01	5.60
1997-10-01	5.65
1997-11-01	5.74
1997-12-01	5.80
1998-01-01	5.54
1998-02-01	5.54
1998-03-01	5.58
1998-04-01	5.58
1998-05-01	5.59
1998-06-01	5.60
1998-07-01	5.59
1998-08-01	5.58
1998-09-01	5.41
1998-10-01	5.21
1998-11-01	5.24
1998-12-01	5.14
1999-01-01	4.89
1999-02-01	4.90
1999-03-01	4.91
1999-04-01	4.88
1999-05-01	4.92
1999-06-01	5.13
1999-07-01	5.24
1999-08-01	5.41
1999-09-01	5.50
1999-10-01	6.13
1999-11-01	6.00
1999-12-01	6.05
2000-01-01	5.95
2000-02-01	6.01
2000-03-01	6.14
2000-04-01	6.28
2000-05-01	6.71
2000-06-01	6.73
2000-07-01	6.67
2000-08-01	6.61
2000-09-01	6.60
2000-10-01	6.67
2000-11-01	6.65
2000-12-01	6.45
2001-01-01	5.62
2001-02-01	5.26
2001-03-01	4.89
2001-04-01	4.53
2001-05-01	4.02
2001-06-01	3.74
2001-07-01	3.66
2001-08-01	3.48
2001-09-01	2.87
2001-10-01	2.31
2001-11-01	2.03
2001-12-01	1.83
2002-01-01	1.74
2002-02-01	1.82
2002-03-01	1.91
2002-04-01	1.87
2002-05-01	1.82
2002-06-01	1.81
2002-07-01	1.79
2002-08-01	1.73
2002-09-01	1.76
2002-10-01	1.73
2002-11-01	1.39
2002-12-01	1.34
2003-01-01	1.29
2003-02-01	1.27
2003-03-01	1.23
2003-04-01	1.24
2003-05-01	1.22
2003-06-01	1.04
2003-07-01	1.05
2003-08-01	1.08
2003-09-01	1.08
2003-10-01	1.10
2003-11-01	1.11
2003-12-01	1.10
2004-01-01	1.06
2004-02-01	1.05
2004-03-01	1.05
2004-04-01	1.08
2004-05-01	1.20
2004-06-01	1.46
2004-07-01	1.57
2004-08-01	1.68
2004-09-01	1.86
2004-10-01	2.04
2004-11-01	2.26
2004-12-01	2.45
2005-01-01	2.61
2005-02-01	2.77
2005-03-01	2.97
2005-04-01	3.09
2005-05-01	3.22
2005-06-01	3.38
2005-07-01	3.57
2005-08-01	3.77
2005-09-01	3.87
2005-10-01	4.13
2005-11-01	4.31
2005-12-01	4.45
2006-01-01	4.56
2006-02-01	4.72
2006-03-01	4.88
2006-04-01	5.03
2006-05-01	5.15
2006-06-01	5.35
2006-07-01	5.46
2006-08-01	5.38
2006-09-01	5.34
2006-10-01	5.33
2006-11-01	5.32
2006-12-01	5.32
2007-01-01	5.32
2007-02-01	5.31
2007-03-01	5.30
2007-04-01	5.31
2007-05-01	5.31
2007-06-01	5.33
2007-07-01	5.32
2007-08-01	5.49
2007-09-01	5.46
2007-10-01	5.08
2007-11-01	4.97
2007-12-01	5.02
2008-01-01	3.84
2008-02-01	3.06
2008-03-01	2.79
2008-04-01	2.85
2008-05-01	2.66
2008-06-01	2.76
2008-07-01	2.79
2008-08-01	2.79
2008-09-01	3.59
2008-10-01	4.32
2008-11-01	2.36
2008-12-01	1.77
2009-01-01	1.02
2009-02-01	1.16
2009-03-01	1.07
2009-04-01	0.89
2009-05-01	0.57
2009-06-01	0.39
2009-07-01	0.35
2009-08-01	0.30
2009-09-01	0.25
2009-10-01	0.24
2009-11-01	0.21
2009-12-01	0.22
2010-01-01	0.20
2010-02-01	0.19
2010-03-01	0.23
2010-04-01	0.30
2010-05-01	0.45
2010-06-01	0.52
2010-07-01	0.41
2010-08-01	0.32
2010-09-01	0.28
2010-10-01	0.27
2010-11-01	0.27
2010-12-01	0.30
2011-01-01	0.29
2011-02-01	0.28
2011-03-01	0.28
2011-04-01	0.23
2011-05-01	0.21
2011-06-01	0.22
2011-07-01	0.24
2011-08-01	0.29
2011-09-01	0.33
2011-10-01	0.37
2011-11-01	0.41
2011-12-01	0.49
2012-01-01	0.40
2012-02-01	0.30
2012-03-01	0.29
2012-04-01	0.29
2012-05-01	0.29
2012-06-01	0.32
2012-07-01	0.30
2012-08-01	0.26
2012-09-01	0.24
2012-10-01	0.23
2012-11-01	0.23
2012-12-01	0.24
2013-01-01	0.23
2013-02-01	0.22
2013-03-01	0.21
2013-04-01	0.20
2013-05-01	0.20
2013-06-01	0.19
2013-07-01	0.14
2013-08-01	0.12
2013-09-01	0.11
2013-10-01	0.12
2013-11-01	0.12
2013-12-01	0.14
2014-01-01	0.12
2014-02-01	0.13
2014-03-01	0.12
2014-04-01	0.12
2014-05-01	0.11
2014-06-01	0.11
2014-07-01	0.13
2014-08-01	0.13
2014-09-01	0.12
2014-10-01	0.12
2014-11-01	0.13
2014-12-01	0.15
2015-01-01	0.16
2015-02-01	0.15
2015-03-01	0.14
2015-04-01	0.13
2015-05-01	0.15
2015-06-01	0.18
2015-07-01	0.19
2015-08-01	0.26
2015-09-01	0.27
2015-10-01	0.25
2015-11-01	0.30
2015-12-01	0.54
2016-01-01	0.57
2016-02-01	0.54
2016-03-01	0.55
2016-04-01	0.55
2016-05-01	0.57
2016-06-01	0.55
2016-07-01	0.62
2016-08-01	0.73
2016-09-01	0.75
2016-10-01	0.72
2016-11-01	0.71
2016-12-01	0.87
2017-01-01	0.90
2017-02-01	0.87
2017-03-01	0.98
2017-04-01	1.03
2017-05-01	1.05
2017-06-01	1.16
2017-07-01	1.22
2017-08-01	1.25
2017-09-01	1.25
2017-10-01	1.26
2017-11-01	1.32
2017-12-01	1.54
2018-01-01	1.63
2018-02-01	1.78
2018-03-01	2.08
2018-04-01	2.20
2018-05-01	2.16
2018-06-01	2.19
2018-07-01	2.17
2018-08-01	2.19
2018-09-01	2.24
2018-10-01	2.37