Month	Percent
1986-01-01	34.82
1986-02-01	30.93
1986-03-01	30.67
1986-04-01	30.41
1986-05-01	30.43
1986-06-01	30.47
1986-07-01	31.10
1986-08-01	31.28
1986-09-01	31.24
1986-10-01	31.37
1986-11-01	31.79
1986-12-01	31.83
1987-01-01	31.58
1987-02-01	30.33
1987-03-01	29.97
1987-04-01	29.80
1987-05-01	29.94
1987-06-01	29.68
1987-07-01	30.33
1987-08-01	30.56
1987-09-01	30.79
1987-10-01	31.37
1987-11-01	32.31
1987-12-01	32.82
1988-01-01	31.35
1988-02-01	32.95
1988-03-01	33.86
1988-04-01	34.75
1988-05-01	35.23
1988-06-01	34.85
1988-07-01	35.20
1988-08-01	35.22
1988-09-01	32.21
1988-10-01	31.79
1988-11-01	31.85
1988-12-01	32.25
1989-01-01	32.23
1989-02-01	32.98
1989-03-01	33.23
1989-04-01	33.68
1989-05-01	33.67
1989-06-01	33.89
1989-07-01	33.91
1989-08-01	33.99
1989-09-01	33.62
1989-10-01	33.97
1989-11-01	34.62
1989-12-01	34.94
1990-01-01	34.42
1990-02-01	34.15
1990-03-01	34.65
1990-04-01	35.76
1990-05-01	35.76
1990-06-01	36.23
1990-07-01	37.59
1990-08-01	37.11
1990-09-01	37.56
1990-10-01	37.94
1990-11-01	37.67
1990-12-01	38.45
1991-01-01	35.89
1991-02-01	34.99
1991-03-01	36.48
1991-04-01	37.99
1991-05-01	36.69
1991-06-01	36.54
1991-07-01	37.49
1991-08-01	38.32
1991-09-01	39.27
1991-10-01	38.09
1991-11-01	37.97
1991-12-01	36.98
1992-01-01	32.69
1992-02-01	28.86
1992-03-01	28.28
1992-04-01	26.75
1992-05-01	24.27
1992-06-01	22.75
1992-07-01	21.89
1992-08-01	25.32
1992-09-01	27.32
1992-10-01	27.61
1992-11-01	26.90
1992-12-01	27.42
1993-01-01	26.27
1993-02-01	26.29
1993-03-01	26.80
1993-04-01	26.71
1993-05-01	26.42
1993-06-01	26.48
1993-07-01	25.34
1993-08-01	24.44
1993-09-01	24.37
1993-10-01	24.90
1993-11-01	25.48
1993-12-01	26.49
1994-01-01	25.82
1994-02-01	25.26
1994-03-01	25.34
1994-04-01	25.31
1994-05-01	26.21
1994-06-01	28.25
1994-07-01	29.15
1994-08-01	30.69
1994-09-01	30.84
1994-10-01	32.53
1994-11-01	35.69
1994-12-01	37.90
1995-01-01	32.28
1995-02-01	34.25
1995-03-01	35.21
1995-04-01	35.69
1995-05-01	34.78
1995-06-01	34.02
1995-07-01	30.18
1995-08-01	29.13
1995-09-01	30.08
1995-10-01	29.38
1995-11-01	29.64
1995-12-01	33.42
1996-01-01	32.52
1996-02-01	33.10
1996-03-01	33.64
1996-04-01	33.63
1996-05-01	32.11
1996-06-01	32.14
1996-07-01	32.41
1996-08-01	30.36
1996-09-01	28.44
1996-10-01	28.72
1996-11-01	28.54
1996-12-01	28.05
1997-01-01	26.50
1997-02-01	25.42
1997-03-01	25.50
1997-04-01	24.74
1997-05-01	23.59
1997-06-01	23.22
1997-07-01	23.16
1997-08-01	22.99
1997-09-01	22.85
1997-10-01	23.24
1997-11-01	24.01
1997-12-01	24.32
1998-01-01	24.59
1998-02-01	25.04
1998-03-01	27.97
1998-04-01	30.72
1998-05-01	31.67
1998-06-01	36.56
1998-07-01	36.43
1998-08-01	34.16
1998-09-01	35.62
1998-10-01	36.53
1998-11-01	36.43
1998-12-01	35.28
1999-01-01	33.23
1999-02-01	30.25
1999-03-01	25.32
1999-04-01	22.08
1999-05-01	19.01
1999-06-01	17.86
1999-07-01	19.15
1999-08-01	18.86
1999-09-01	18.05
1999-10-01	18.15
1999-11-01	17.89
1999-12-01	16.09
2000-01-01	12.59
2000-02-01	10.21
2000-03-01	10.90
2000-04-01	11.41
2000-05-01	11.72
2000-06-01	12.00
2000-07-01	12.20
2000-08-01	12.48
2000-09-01	12.94
2000-10-01	12.95
2000-11-01	13.08
2000-12-01	13.28
2001-01-01	13.50
2001-02-01	13.34
2001-03-01	13.02
2001-04-01	12.74
2001-05-01	12.72
2001-06-01	12.70
2001-07-01	12.66
2001-08-01	12.34
2001-09-01	11.86
2001-10-01	11.46
2001-11-01	11.48
2001-12-01	11.40
2002-01-01	11.21
2002-02-01	10.75
2002-03-01	10.60
2002-04-01	10.01
2002-05-01	9.07
2002-06-01	8.41
2002-07-01	7.86
2002-08-01	7.90
2002-09-01	7.93
2002-10-01	7.90
2002-11-01	7.89
2002-12-01	7.73
2003-01-01	7.68
2003-02-01	7.77
2003-03-01	7.76
2003-04-01	7.72
2003-05-01	7.79
2003-06-01	7.77
2003-07-01	7.82
2003-08-01	7.83
2003-09-01	7.80
2003-10-01	7.82
2003-11-01	7.93
2003-12-01	7.95
2004-01-01	7.98
2004-02-01	7.85
2004-03-01	7.80
2004-04-01	7.84
2004-05-01	7.81
2004-06-01	7.86
2004-07-01	7.83
2004-08-01	7.76
2004-09-01	7.74
2004-10-01	7.68
2004-11-01	7.67
2004-12-01	7.76
2005-01-01	7.67
2005-02-01	7.41
2005-03-01	7.34
2005-04-01	7.29
2005-05-01	7.18
2005-06-01	7.18
2005-07-01	7.10
2005-08-01	6.99
2005-09-01	6.84
2005-10-01	6.46
2005-11-01	6.41
2005-12-01	6.30
2006-01-01	6.14
2006-02-01	6.01
2006-03-01	5.97
2006-04-01	5.93
2006-05-01	5.97
2006-06-01	6.12
2006-07-01	6.51
2006-08-01	6.37
2006-09-01	6.42
2006-10-01	6.42
2006-11-01	6.68
2006-12-01	6.75
2007-01-01	6.81
2007-02-01	6.80
2007-03-01	7.52
2007-04-01	7.45
2007-05-01	7.61
2007-06-01	8.02
2007-07-01	8.29
2007-08-01	8.54
2007-09-01	8.89
2007-10-01	8.59
2007-11-01	8.67
2007-12-01	8.98
2008-01-01	9.12
2008-02-01	9.30
2008-03-01	9.59
2008-04-01	9.79
2008-05-01	9.59
2008-06-01	9.75
2008-07-01	9.61
2008-08-01	9.96
2008-09-01	9.92
2008-10-01	10.02
2008-11-01	10.13
2008-12-01	10.12
2009-01-01	9.69
2009-02-01	8.98
2009-03-01	8.17
2009-04-01	7.12
2009-05-01	6.20
2009-06-01	5.52
2009-07-01	5.15
2009-08-01	5.08
2009-09-01	4.89
2009-10-01	4.41
2009-11-01	4.40
2009-12-01	4.12
2010-01-01	4.04
2010-02-01	4.00
2010-03-01	3.93
2010-04-01	3.92
2010-05-01	3.63
2010-06-01	3.54
2010-07-01	3.52
2010-08-01	3.50
2010-09-01	3.47
2010-10-01	3.45
2010-11-01	3.44
2010-12-01	3.50
2011-01-01	3.48
2011-02-01	3.46
2011-03-01	3.59
2011-04-01	3.74
2011-05-01	3.88
2011-06-01	4.10
2011-07-01	4.21
2011-08-01	4.49
2011-09-01	4.61
2011-10-01	4.72
2011-11-01	5.08
2011-12-01	5.12
2012-01-01	5.13
2012-02-01	5.27
2012-03-01	5.36
2012-04-01	5.47
2012-05-01	5.45
2012-06-01	5.45
2012-07-01	5.44
2012-08-01	5.41
2012-09-01	5.32
2012-10-01	5.42
2012-11-01	5.31
2012-12-01	5.22
2013-01-01	5.12
2013-02-01	4.82
2013-03-01	4.57
2013-04-01	4.21
2013-05-01	3.98
2013-06-01	3.94
2013-07-01	3.98
2013-08-01	4.07
2013-09-01	4.07
2013-10-01	4.02
2013-11-01	4.03
2013-12-01	4.06
2014-01-01	4.03
2014-02-01	3.97
2014-03-01	3.89
2014-04-01	3.81
2014-05-01	3.79
2014-06-01	3.94
2014-07-01	4.06
2014-08-01	4.04
2014-09-01	4.26
2014-10-01	4.33
2014-11-01	4.36
2014-12-01	4.34
2015-01-01	4.47
2015-02-01	4.45
2015-03-01	4.41
2015-04-01	4.51
2015-05-01	4.42
2015-06-01	4.40
2015-07-01	4.52
2015-08-01	4.47
2015-09-01	4.41
2015-10-01	4.72
2015-11-01	4.92
2015-12-01	5.24
2016-01-01	5.74
2016-02-01	6.25
2016-03-01	6.35
2016-04-01	6.65
2016-05-01	6.83
2016-06-01	6.91
2016-07-01	7.26
2016-08-01	7.19
2016-09-01	7.18
2016-10-01	7.09
2016-11-01	7.01
2016-12-01	6.92
2017-01-01	6.94
2017-02-01	6.78
2017-03-01	6.65
2017-04-01	6.53
2017-05-01	6.17
2017-06-01	5.96
2017-07-01	5.65
2017-08-01	5.58
2017-09-01	5.52
2017-10-01	5.46
2017-11-01	5.35
2017-12-01	5.28
2018-01-01	5.21
2018-02-01	5.07
2018-03-01	5.01
2018-04-01	4.90
2018-05-01	4.70
2018-06-01	4.60
2018-07-01	4.57
2018-08-01	4.53
2018-09-01	4.53
2018-10-01	4.43