Month	Percent
1985-01-01	14.89
1985-02-01	20.30
1985-03-01	67.32
1985-04-01	17.43
1985-05-01	21.20
1985-06-01	21.75
1985-07-01	22.41
1985-08-01	23.31
1985-09-01	24.64
1985-10-01	23.58
1985-11-01	20.60
1985-12-01	19.49
1986-01-01	17.21
1986-02-01	19.06
1986-03-01	19.45
1986-04-01	21.23
1986-05-01	17.86
1986-06-01	14.66
1986-07-01	15.35
1986-08-01	15.72
1986-09-01	14.50
1986-10-01	16.30
1986-11-01	18.27
1986-12-01	22.74
1987-01-01	23.30
1987-02-01	25.42
1987-03-01	27.20
1987-04-01	31.13
1987-05-01	22.57
1987-06-01	18.98
1987-07-01	17.91
1987-08-01	16.63
1987-09-01	18.31
1987-10-01	20.13
1987-11-01	18.02
1987-12-01	16.33
1988-01-01	15.34
1988-02-01	16.70
1988-03-01	15.50
1988-04-01	17.76
1988-05-01	17.18
1988-06-01	15.94
1988-07-01	15.08
1988-08-01	14.42
1988-09-01	14.27
1988-10-01	14.68
1988-11-01	13.28
1988-12-01	13.10
1989-01-01	13.36
1989-02-01	13.74
1989-03-01	12.80
1989-04-01	14.02
1989-05-01	13.74
1989-06-01	13.40
1989-07-01	13.13
1989-08-01	13.13
1989-09-01	13.73
1989-10-01	13.23
1989-11-01	13.29
1989-12-01	13.18
1990-01-01	13.51
1990-02-01	13.73
1990-03-01	13.12
1990-04-01	13.23
1990-05-01	12.82
1990-06-01	13.69
1990-07-01	13.45
1990-08-01	14.55
1990-09-01	13.87
1990-10-01	13.98
1990-11-01	13.41
1990-12-01	11.63
1991-01-01	11.75
1991-02-01	11.75
1991-03-01	11.77
1991-04-01	11.11
1991-05-01	10.29
1991-06-01	10.12
1991-07-01	9.98
1991-08-01	9.54
1991-09-01	8.92
1991-10-01	7.96
1991-11-01	8.28
1991-12-01	7.75
1992-01-01	7.31
1992-02-01	7.28
1992-03-01	7.04
1992-04-01	6.81
1992-05-01	6.75
1992-06-01	6.69
1992-07-01	6.18
1992-08-01	6.08
1992-09-01	6.26
1992-10-01	6.15
1992-11-01	6.04
1992-12-01	7.01
1993-01-01	10.07
1993-02-01	7.57
1993-03-01	7.06
1993-04-01	6.91
1993-05-01	6.26
1993-06-01	5.91
1993-07-01	5.26
1993-08-01	5.28
1993-09-01	4.90
1993-10-01	5.12
1993-11-01	5.91
1993-12-01	4.80
1994-01-01	4.54
1994-02-01	4.32
1994-03-01	5.70
1994-04-01	6.50
1994-05-01	5.29
1994-06-01	5.16
1994-07-01	6.39
1994-08-01	5.90
1994-09-01	6.41
1994-10-01	7.13
1994-11-01	7.44
1994-12-01	8.39
1995-01-01	8.41
1995-02-01	8.80
1995-03-01	9.15
1995-04-01	8.99
1995-05-01	8.98
1995-06-01	9.00
1995-07-01	8.87
1995-08-01	9.08
1995-09-01	9.52
1995-10-01	8.87
1995-11-01	8.48
1995-12-01	8.69
1996-01-01	8.78
1996-02-01	8.55
1996-03-01	9.07
1996-04-01	9.28
1996-05-01	9.68
1996-06-01	9.53
1996-07-01	9.86
1996-08-01	9.91
1996-09-01	9.98
1996-10-01	10.00
1996-11-01	9.44
1996-12-01	8.40
1997-01-01	7.63
1997-02-01	7.31
1997-03-01	7.44
1997-04-01	7.15
1997-05-01	6.57
1997-06-01	6.67
1997-07-01	7.77
1997-08-01	8.10
1997-09-01	7.87
1997-10-01	7.34
1997-11-01	7.11
1997-12-01	7.64
1998-01-01	8.66
1998-02-01	8.77
1998-03-01	8.60
1998-04-01	9.16
1998-05-01	8.60
1998-06-01	8.91
1998-07-01	7.10
1998-08-01	5.98
1998-09-01	5.43
1998-10-01	4.07
1998-11-01	3.56
1998-12-01	3.49
1999-01-01	3.35
1999-02-01	3.30
1999-03-01	4.07
1999-04-01	4.50
1999-05-01	4.50
1999-06-01	4.54
1999-07-01	4.51
1999-08-01	4.50
1999-09-01	4.50
1999-10-01	4.50
1999-11-01	4.71
1999-12-01	5.00
2000-01-01	5.12
2000-02-01	5.26
2000-03-01	5.51
2000-04-01	5.82
2000-05-01	6.24
2000-06-01	6.50
2000-07-01	6.50
2000-08-01	6.50
2000-09-01	6.50
2000-10-01	6.50
2000-11-01	6.50
2000-12-01	6.51
2001-01-01	6.50
2001-02-01	6.50
2001-03-01	6.35
2001-04-01	6.15
2001-05-01	5.87
2001-06-01	5.75
2001-07-01	5.75
2001-08-01	5.76
2001-09-01	5.55
2001-10-01	5.25
2001-11-01	4.96
2001-12-01	4.75
2002-01-01	4.75
2002-02-01	4.75
2002-03-01	4.84
2002-04-01	5.11
2002-05-01	5.39
2002-06-01	5.50
2002-07-01	5.73
2002-08-01	5.75
2002-09-01	5.75
2002-10-01	5.75
2002-11-01	5.75
2002-12-01	5.75
2003-01-01	5.75
2003-02-01	5.75
2003-03-01	5.75
2003-04-01	5.70
2003-05-01	5.51
2003-06-01	5.28
2003-07-01	5.19
2003-08-01	5.00
2003-09-01	5.00
2003-10-01	5.00
2003-11-01	5.00
2003-12-01	5.00
2004-01-01	5.03
2004-02-01	5.25
2004-03-01	5.25
2004-04-01	5.28
2004-05-01	5.50
2004-06-01	5.68
2004-07-01	5.77
2004-08-01	6.00
2004-09-01	6.18
2004-10-01	6.28
2004-11-01	6.50
2004-12-01	6.50
2005-01-01	6.50
2005-02-01	6.50
2005-03-01	6.67
2005-04-01	6.75
2005-05-01	6.75
2005-06-01	6.75
2005-07-01	6.75
2005-08-01	6.75
2005-09-01	6.75
2005-10-01	6.79
2005-11-01	7.00
2005-12-01	7.19
2006-01-01	7.25
2006-02-01	7.25
2006-03-01	7.25
2006-04-01	7.25
2006-05-01	7.25
2006-06-01	7.25
2006-07-01	7.25
2006-08-01	7.25
2006-09-01	7.25
2006-10-01	7.35
2006-11-01	7.45
2006-12-01	7.51
2007-01-01	7.41
2007-02-01	7.41
2007-03-01	7.59
2007-04-01	7.70
2007-05-01	7.89
2007-06-01	8.10
2007-07-01	8.20
2007-08-01	8.28
2007-09-01	8.02
2007-10-01	8.07
2007-11-01	8.33
2007-12-01	8.18
2008-01-01	8.16
2008-02-01	8.20
2008-03-01	8.10
2008-04-01	8.05
2008-05-01	8.06
2008-06-01	8.21
2008-07-01	8.03
2008-08-01	7.89
2008-09-01	7.52
2008-10-01	7.10
2008-11-01	6.26
2008-12-01	5.05
2009-01-01	4.66
2009-02-01	3.36
2009-03-01	3.08
2009-04-01	3.01
2009-05-01	2.37
2009-06-01	2.45
2009-07-01	2.43
2009-08-01	2.53
2009-09-01	2.58
2009-10-01	2.49
2009-11-01	2.41
2009-12-01	2.43
2010-01-01	2.42
2010-02-01	2.32
2010-03-01	2.35
2010-04-01	2.28
2010-05-01	2.32
2010-06-01	2.49
2010-07-01	2.68
2010-08-01	2.88
2010-09-01	2.91
2010-10-01	2.94
2010-11-01	2.91
2010-12-01	2.88
2011-01-01	2.92
2011-02-01	2.91
2011-03-01	2.50
2011-04-01	2.50
2011-05-01	2.45
2011-06-01	2.46
2011-07-01	2.40
2011-08-01	2.44
2011-09-01	2.39
2011-10-01	2.33
2011-11-01	2.34
2011-12-01	2.34
2012-01-01	2.40
2012-02-01	2.41
2012-03-01	2.43
2012-04-01	2.45
2012-05-01	2.44
2012-06-01	2.43
2012-07-01	2.50
2012-08-01	2.52
2012-09-01	2.49
2012-10-01	2.48
2012-11-01	2.49
2012-12-01	2.51
2013-01-01	2.45
2013-02-01	2.49
2013-03-01	2.47
2013-04-01	2.42
2013-05-01	2.48
2013-06-01	2.47
2013-07-01	2.43
2013-08-01	2.49
2013-09-01	2.50
2013-10-01	2.50
2013-11-01	2.49
2013-12-01	2.50
2014-01-01	2.52
2014-02-01	2.51
2014-03-01	2.65
2014-04-01	2.79
2014-05-01	3.00
2014-06-01	3.13
2014-07-01	3.28
2014-08-01	3.45
2014-09-01	3.46
2014-10-01	3.42
2014-11-01	3.42
2014-12-01	3.40
2015-01-01	3.42
2015-02-01	3.40
2015-03-01	3.42
2015-04-01	3.44
2015-05-01	3.41
2015-06-01	3.25
2015-07-01	3.07
2015-08-01	2.90
2015-09-01	2.76
2015-10-01	2.68
2015-11-01	2.65
2015-12-01	2.55
2016-01-01	2.39
2016-02-01	2.37
2016-03-01	2.21
2016-04-01	2.17
2016-05-01	2.16
2016-06-01	2.16
2016-07-01	2.11
2016-08-01	2.06
2016-09-01	1.92
2016-10-01	1.88
2016-11-01	1.74
2016-12-01	1.68
2017-01-01	1.66
2017-02-01	1.71
2017-03-01	1.66
2017-04-01	1.62
2017-05-01	1.67
2017-06-01	1.71
2017-07-01	1.63
2017-08-01	1.65
2017-09-01	1.64
2017-10-01	1.61
2017-11-01	1.64
2017-12-01	1.67
2018-01-01	1.66
2018-02-01	1.67
2018-03-01	1.67
2018-04-01	1.71
2018-05-01	1.73
2018-06-01	1.69
2018-07-01	1.67
2018-08-01	1.71
2018-09-01	1.68
2018-10-01	1.68