Month	Percent
1987-01-01	7.44
1987-02-01	7.51
1987-03-01	7.35
1987-04-01	7.17
1987-05-01	7.11
1987-06-01	7.15
1987-07-01	7.09
1987-08-01	7.07
1987-09-01	7.07
1987-10-01	7.16
1987-11-01	7.26
1987-12-01	7.15
1988-01-01	7.06
1988-02-01	7.04
1988-03-01	6.83
1988-04-01	6.80
1988-05-01	6.86
1988-06-01	6.94
1988-07-01	7.00
1988-08-01	7.17
1988-09-01	7.26
1988-10-01	7.31
1988-11-01	7.28
1988-12-01	7.21
1989-01-01	7.30
1989-02-01	7.37
1989-03-01	7.51
1989-04-01	7.61
1989-05-01	7.62
1989-06-01	7.72
1989-07-01	7.72
1989-08-01	7.72
1989-09-01	7.72
1989-10-01	8.02
1989-11-01	8.21
1989-12-01	8.39
1990-01-01	8.45
1990-02-01	9.26
1990-03-01	9.73
1990-04-01	9.40
1990-05-01	9.14
1990-06-01	9.13
1990-07-01	9.05
1990-08-01	9.08
1990-09-01	9.53
1990-10-01	9.72
1990-11-01	9.71
1990-12-01	9.40
1991-01-01	9.44
1991-02-01	9.44
1991-03-01	9.06
1991-04-01	8.86
1991-05-01	8.87
1991-06-01	8.83
1991-07-01	8.81
1991-08-01	8.89
1991-09-01	8.94
1991-10-01	8.94
1991-11-01	8.93
1991-12-01	8.99
1992-01-01	8.95
1992-02-01	8.82
1992-03-01	8.80
1992-04-01	8.80
1992-05-01	8.82
1992-06-01	8.78
1992-07-01	8.91
1992-08-01	8.97
1992-09-01	9.04
1992-10-01	8.85
1992-11-01	8.68
1992-12-01	8.60
1993-01-01	8.03
1993-02-01	7.87
1993-03-01	7.82
1993-04-01	7.74
1993-05-01	7.64
1993-06-01	7.51
1993-07-01	7.34
1993-08-01	7.36
1993-09-01	7.60
1993-10-01	7.56
1993-11-01	7.37
1993-12-01	7.15
1994-01-01	6.98
1994-02-01	6.88
1994-03-01	6.90
1994-04-01	6.98
1994-05-01	7.01
1994-06-01	7.58
1994-07-01	7.71
1994-08-01	7.81
1994-09-01	8.11
1994-10-01	8.21
1994-11-01	8.29
1994-12-01	8.02
1995-01-01	8.05
1995-02-01	8.06
1995-03-01	8.03
1995-04-01	7.86
1995-05-01	7.64
1995-06-01	7.35
1995-07-01	7.31
1995-08-01	7.20
1995-09-01	7.12
1995-10-01	7.12
1995-11-01	7.02
1995-12-01	6.54
1996-01-01	6.88
1996-02-01	6.77
1996-03-01	6.81
1996-04-01	6.70
1996-05-01	6.66
1996-06-01	6.64
1996-07-01	6.54
1996-08-01	6.46
1996-09-01	6.34
1996-10-01	6.11
1996-11-01	6.04
1996-12-01	5.96
1997-01-01	5.92
1997-02-01	5.75
1997-03-01	5.77
1997-04-01	5.90
1997-05-01	5.83
1997-06-01	5.77
1997-07-01	5.73
1997-08-01	5.71
1997-09-01	5.73
1997-10-01	5.71
1997-11-01	5.74
1997-12-01	5.65
1998-01-01	5.44
1998-02-01	5.31
1998-03-01	5.21
1998-04-01	5.24
1998-05-01	5.30
1998-06-01	5.03
1998-07-01	5.20
1998-08-01	5.10
1998-09-01	4.83
1998-10-01	4.78
1998-11-01	4.71
1998-12-01	4.68
1999-01-01	4.15
1999-02-01	4.17
1999-03-01	4.37
1999-04-01	4.24
1999-05-01	4.34
1999-06-01	4.61
1999-07-01	4.97
1999-08-01	5.28
1999-09-01	5.44
1999-10-01	5.57
1999-11-01	5.28
1999-12-01	5.52
2000-01-01	5.88
2000-02-01	5.96
2000-03-01	5.84
2000-04-01	5.72
2000-05-01	5.97
2000-06-01	5.93
2000-07-01	5.97
2000-08-01	5.98
2000-09-01	6.01
2000-10-01	5.96
2000-11-01	6.00
2000-12-01	5.74
2001-01-01	5.56
2001-02-01	5.50
2001-03-01	5.41
2001-04-01	5.47
2001-05-01	5.62
2001-06-01	5.55
2001-07-01	5.58
2001-08-01	5.35
2001-09-01	5.23
2001-10-01	5.06
2001-11-01	4.93
2001-12-01	5.21
2002-01-01	5.31
2002-02-01	5.42
2002-03-01	5.61
2002-04-01	5.56
2002-05-01	5.61
2002-06-01	5.47
2002-07-01	5.36
2002-08-01	5.19
2002-09-01	4.95
2002-10-01	5.09
2002-11-01	5.05
2002-12-01	4.83
2003-01-01	4.65
2003-02-01	4.46
2003-03-01	4.34
2003-04-01	4.44
2003-05-01	4.07
2003-06-01	3.78
2003-07-01	4.15
2003-08-01	4.37
2003-09-01	4.37
2003-10-01	4.41
2003-11-01	4.54
2003-12-01	4.47
2004-01-01	4.30
2004-02-01	4.32
2004-03-01	4.16
2004-04-01	4.32
2004-05-01	4.46
2004-06-01	4.49
2004-07-01	4.37
2004-08-01	4.20
2004-09-01	4.25
2004-10-01	4.15
2004-11-01	4.02
2004-12-01	3.82
2005-01-01	3.62
2005-02-01	3.74
2005-03-01	3.86
2005-04-01	3.69
2005-05-01	3.54
2005-06-01	3.37
2005-07-01	3.39
2005-08-01	3.40
2005-09-01	3.25
2005-10-01	3.44
2005-11-01	3.67
2005-12-01	3.59
2006-01-01	3.59
2006-02-01	3.76
2006-03-01	4.09
2006-04-01	4.20
2006-05-01	4.24
2006-06-01	4.27
2006-07-01	4.31
2006-08-01	4.20
2006-09-01	4.11
2006-10-01	4.15
2006-11-01	4.09
2006-12-01	4.16
2007-01-01	4.36
2007-02-01	4.45
2007-03-01	4.39
2007-04-01	4.58
2007-05-01	4.69
2007-06-01	4.95
2007-07-01	4.97
2007-08-01	4.90
2007-09-01	4.90
2007-10-01	4.92
2007-11-01	4.94
2007-12-01	5.10
2008-01-01	4.98
2008-02-01	5.03
2008-03-01	5.13
2008-04-01	5.34
2008-05-01	5.32
2008-06-01	5.33
2008-07-01	5.74
2008-08-01	5.49
2008-09-01	5.75
2008-10-01	5.76
2008-11-01	6.21
2008-12-01	5.32
2009-01-01	5.13
2009-02-01	5.00
2009-03-01	5.05
2009-04-01	5.07
2009-05-01	5.01
2009-06-01	4.96
2009-07-01	4.50
2009-08-01	4.09
2009-09-01	3.96
2009-10-01	3.89
2009-11-01	3.82
2009-12-01	3.74
2010-01-01	3.77
2010-02-01	3.75
2010-03-01	3.63
2010-04-01	3.55
2010-05-01	3.41
2010-06-01	3.34
2010-07-01	3.35
2010-08-01	3.01
2010-09-01	3.02
2010-10-01	3.11
2010-11-01	3.41
2010-12-01	3.88
2011-01-01	3.89
2011-02-01	4.05
2011-03-01	4.08
2011-04-01	4.27
2011-05-01	4.04
2011-06-01	4.00
2011-07-01	3.94
2011-08-01	3.77
2011-09-01	3.73
2011-10-01	3.81
2011-11-01	3.70
2011-12-01	3.83
2012-01-01	3.61
2012-02-01	3.33
2012-03-01	3.08
2012-04-01	2.91
2012-05-01	2.69
2012-06-01	2.63
2012-07-01	2.40
2012-08-01	2.22
2012-09-01	2.23
2012-10-01	2.19
2012-11-01	2.00
2012-12-01	1.93
2013-01-01	2.08
2013-02-01	2.15
2013-03-01	1.96
2013-04-01	1.77
2013-05-01	1.77
2013-06-01	2.04
2013-07-01	2.13
2013-08-01	2.25
2013-09-01	2.34
2013-10-01	2.21
2013-11-01	2.12
2013-12-01	2.19
2014-01-01	2.14
2014-02-01	1.95
2014-03-01	0.99
2014-04-01	1.80