Month	Percent
1997-07-01	12.54
1997-08-01	13.77
1997-09-01	13.47
1997-10-01	14.82
1997-11-01	13.04
1997-12-01	10.63
1998-01-01	19.17
1998-02-01	18.23
1998-03-01	14.36
1998-04-01	15.72
1998-05-01	14.75
1998-06-01	14.86
1998-07-01	16.48
1998-08-01	18.65
1998-10-01	18.78
1998-11-01	14.89
1998-12-01	13.49
1999-01-01	12.75
1999-02-01	10.04
1999-03-01	11.09
1999-04-01	13.59
1999-05-01	11.71
1999-06-01	9.28
1999-07-01	9.76
1999-08-01	9.93
1999-09-01	9.91
1999-10-01	10.68
1999-11-01	11.63
1999-12-01	11.09
2000-01-01	10.05
2000-02-01	12.17
2000-03-01	13.43
2000-04-01	11.76
2000-05-01	10.67
2000-06-01	9.72
2000-07-01	9.90
2000-08-01	9.37
2000-09-01	10.32
2000-10-01	11.50
2000-11-01	10.90
2000-12-01	9.30
2001-01-01	8.30
2001-02-01	8.06
2001-03-01	6.14
2001-04-01	8.62
2001-05-01	8.69
2001-06-01	6.74
2001-07-01	6.44
2001-08-01	7.07
2001-09-01	7.18
2001-10-01	6.61
2001-11-01	6.44
2001-12-01	6.51
2002-01-01	6.00
2002-02-01	5.56
2002-03-01	4.73
2002-04-01	4.39
2002-05-01	4.15
2002-06-01	4.03
2002-07-01	3.51
2002-08-01	2.96
2002-09-01	2.99
2002-10-01	3.03
2002-11-01	2.87
2002-12-01	2.88
2003-01-01	2.97
2003-02-01	2.94
2003-03-01	2.65
2003-04-01	2.48
2003-05-01	2.59
2003-06-01	2.78
2003-07-01	2.97
2003-08-01	2.94
2003-09-01	2.84
2003-10-01	2.75
2003-11-01	2.72
2003-12-01	2.58
2004-01-01	1.80
2004-02-01	1.58
2004-03-01	1.57
2004-04-01	1.49
2004-05-01	1.31
2004-06-01	1.53
2004-07-01	1.66
2004-08-01	1.68
2004-09-01	2.33
2004-10-01	2.35
2004-11-01	2.34
2004-12-01	2.32
2005-01-01	2.49
2005-02-01	2.95
2005-03-01	2.83
2005-04-01	2.92
2005-05-01	3.24
2005-06-01	2.85
2005-07-01	3.01
2005-08-01	3.83
2005-09-01	4.25
2005-10-01	4.52
2005-11-01	4.73
2005-12-01	4.75
2006-01-01	4.64
2006-02-01	4.39
2006-03-01	4.48
2006-04-01	4.50
2006-05-01	4.64
2006-06-01	4.82
2006-07-01	4.92
2006-08-01	5.20
2006-09-01	5.21
2006-10-01	4.95
2006-11-01	5.06
2006-12-01	5.10
2007-01-01	5.04
2007-02-01	4.84
2007-03-01	4.61
2007-04-01	4.75
2007-05-01	4.86
2007-06-01	4.75
2007-07-01	4.87
2007-08-01	5.45
2007-09-01	5.50
2007-10-01	5.41
2007-11-01	5.92
2007-12-01	6.15
2008-01-01	6.50
2008-02-01	6.60
2008-03-01	6.61
2008-04-01	6.61
2008-05-01	6.68
2008-06-01	7.32
2008-07-01	7.57
2008-11-01	8.36
2008-12-01	8.18
2009-01-01	6.74
2009-02-01	4.43
2009-03-01	2.62
2009-04-01	1.89
2009-05-01	1.20
2009-06-01	1.08
2009-07-01	0.60
2009-08-01	0.46
2009-09-01	0.49
2009-10-01	0.49
2009-11-01	0.48
2009-12-01	0.48
2010-01-01	0.46
2010-02-01	0.49
2010-03-01	0.50
2010-06-01	1.44
2010-07-01	1.85
2010-08-01	2.47
2010-09-01	2.99
2010-10-01	3.21
2010-11-01	3.26
2010-12-01	3.40
2011-01-01	3.60
2011-02-01	3.88
2011-03-01	4.26
2011-04-01	5.01
2011-05-01	5.37
2011-06-01	5.55
2011-07-01	5.56
2011-08-01	5.35
2011-09-01	5.28
2011-10-01	5.14
2011-11-01	5.11
2012-01-01	4.84
2012-02-01	4.98
2012-03-01	5.07
2012-04-01	5.05
2012-05-01	5.16
2012-09-01	4.96
2013-01-01	5.08
2013-04-01	5.03
2013-05-01	4.98
2013-06-01	4.91
2013-07-01	4.88
2013-09-01	4.75
2014-01-01	4.45
2014-02-01	4.19
2014-03-01	4.04
2014-04-01	3.72
2014-06-01	3.95
2014-07-01	3.77
2015-01-01	2.81
2015-02-01	3.08
2015-03-01	1.53
2015-04-01	3.03
2015-06-01	2.85
2016-01-01	3.50
2016-02-01	3.62
2016-03-01	3.60
2016-04-01	3.50
2016-05-01	3.54
2016-06-01	3.52
2016-07-01	3.50
2016-08-01	3.48
2016-09-01	3.50
2016-10-01	3.48
2017-01-01	3.22
2017-04-01	2.72
2017-05-01	2.54
2017-06-01	2.49
2017-07-01	2.45
2017-08-01	2.47
2017-09-01	2.49
2017-10-01	2.50
2017-11-01	2.49
2018-01-01	2.50
2018-02-01	2.52
2018-03-01	2.62
2018-04-01	2.62
2018-05-01	2.59
2018-06-01	2.63
2018-07-01	2.63
2018-08-01	2.63
2018-09-01	2.63