Month	Percent
1997-01-01	25.38
1997-02-01	23.54
1997-03-01	23.73
1997-04-01	23.97
1997-05-01	21.73
1997-06-01	22.41
1997-07-01	20.73
1997-08-01	21.27
1997-09-01	21.27
1997-10-01	20.47
1997-11-01	22.55
1997-12-01	20.48
1998-01-01	19.95
1998-02-01	20.67
1998-03-01	21.83
1998-04-01	20.44
1998-05-01	20.27
1998-06-01	21.79
1998-07-01	22.66
1998-08-01	27.20
1998-09-01	40.35
1998-10-01	38.69
1998-11-01	35.56
1998-12-01	36.29
1999-01-01	35.45
1999-02-01	31.35
1999-03-01	26.37
1999-04-01	22.99
1999-05-01	23.26
1999-06-01	23.77
1999-07-01	22.98
1999-08-01	24.36
1999-09-01	23.43
1999-10-01	22.41
1999-11-01	20.09
1999-12-01	19.06
2000-01-01	18.69
2000-02-01	18.12
2000-03-01	15.86
2000-04-01	15.10
2000-05-01	16.77
2000-06-01	17.73
2000-07-01	15.40
2000-08-01	16.84
2000-09-01	17.13
2000-10-01	17.99
2000-11-01	18.76
2000-12-01	18.39
2001-01-01	18.86
2001-02-01	18.36
2001-03-01	17.22
2001-04-01	16.31
2001-05-01	14.22
2001-06-01	11.90
2001-07-01	11.60
2001-08-01	10.22
2001-09-01	12.19
2001-10-01	11.16
2001-11-01	10.21
2001-12-01	8.87
2002-01-01	8.44
2002-02-01	9.06
2002-03-01	8.61
2002-04-01	7.12
2002-05-01	7.63
2002-06-01	8.65
2002-07-01	8.73
2002-08-01	7.95
2002-09-01	8.74
2002-10-01	9.10
2002-11-01	8.73
2002-12-01	8.64
2003-01-01	9.38
2003-02-01	9.85
2003-03-01	10.04
2003-04-01	8.70
2003-05-01	6.74
2003-06-01	6.19
2003-07-01	5.70
2003-08-01	5.54
2003-09-01	5.50
2003-10-01	5.93
2003-11-01	5.83
2003-12-01	6.57
2004-01-01	5.55
2004-02-01	6.07
2004-03-01	6.55
2004-04-01	6.37
2004-05-01	7.31
2004-06-01	7.59
2004-07-01	7.63
2004-08-01	7.84
2004-09-01	8.06
2004-10-01	8.46
2004-11-01	8.85
2004-12-01	9.03
2005-01-01	9.03
2005-02-01	9.59
2005-03-01	9.98
2005-04-01	10.22
2005-05-01	10.21
2005-06-01	10.01
2005-07-01	10.03
2005-08-01	10.03
2005-09-01	9.45
2005-10-01	9.25
2005-11-01	9.14
2005-12-01	8.64
2006-01-01	8.16
2006-02-01	7.93
2006-03-01	7.78
2006-04-01	7.72
2006-05-01	7.59
2006-06-01	7.68
2006-07-01	7.57
2006-08-01	7.48
2006-09-01	7.50
2006-10-01	7.65
2006-11-01	7.62
2006-12-01	7.60
2007-01-01	7.67
2007-02-01	7.67
2007-03-01	7.68
2007-04-01	7.61
2007-05-01	7.83
2007-06-01	7.82
2007-07-01	7.78
2007-08-01	7.79
2007-09-01	7.77
2007-10-01	7.78
2007-11-01	8.01
2007-12-01	8.00
2008-01-01	7.99
2008-02-01	7.93
2008-03-01	7.94
2008-04-01	7.96
2008-05-01	7.96
2008-06-01	8.10
2008-07-01	8.49
2008-08-01	8.71
2008-09-01	8.74
2008-10-01	8.76
2008-11-01	8.83
2008-12-01	8.82
2009-01-01	8.41
2009-02-01	7.86
2009-03-01	7.54
2009-04-01	6.50
2009-05-01	5.65
2009-06-01	5.18
2009-07-01	4.91
2009-08-01	4.95
2009-09-01	5.00
2009-10-01	5.00
2009-11-01	5.08
2009-12-01	5.07
2010-01-01	5.06
2010-02-01	5.03
2010-03-01	5.03
2010-04-01	5.03
2010-05-01	5.04
2010-06-01	5.01
2010-07-01	5.01
2010-08-01	4.99
2010-09-01	4.98
2010-10-01	4.95
2010-11-01	4.92
2010-12-01	4.95
2011-01-01	4.92
2011-02-01	4.88
2011-03-01	4.87
2011-04-01	4.88
2011-05-01	4.88
2011-06-01	4.89
2011-07-01	4.86
2011-08-01	4.85
2011-09-01	4.80
2011-10-01	4.81
2011-11-01	4.81
2011-12-01	4.81
2012-01-01	4.80
2012-02-01	4.80
2012-03-01	4.79
2012-04-01	4.76
2012-05-01	4.78
2012-06-01	4.78
2012-07-01	4.79
2012-08-01	4.80
2012-09-01	4.82
2012-10-01	4.84
2012-11-01	4.86
2012-12-01	4.86
2013-01-01	4.86
2013-02-01	4.82
2013-03-01	4.49
2013-04-01	4.34
2013-05-01	4.32
2013-06-01	4.31
2013-07-01	4.32
2013-08-01	4.31
2013-09-01	4.11
2013-10-01	3.97
2013-11-01	3.79
2013-12-01	3.79
2014-01-01	3.80
2014-02-01	3.80
2014-03-01	3.81
2014-04-01	3.81
2014-05-01	3.82
2014-06-01	3.44
2014-07-01	3.31
2014-08-01	3.31
2014-09-01	3.30
2014-10-01	3.30
2014-11-01	3.30
2014-12-01	3.31
2015-01-01	3.31
2015-02-01	3.31
2015-03-01	3.33
2015-04-01	3.31
2015-05-01	3.31
2015-06-01	3.31
2015-07-01	3.32
2015-08-01	3.35
2015-09-01	3.36
2015-10-01	3.32
2015-11-01	3.38
2015-12-01	3.50
2016-01-01	3.59
2016-02-01	3.78
2016-03-01	4.11
2016-04-01	4.12
2016-05-01	4.14
2016-06-01	4.21
2016-07-01	4.66
2016-08-01	4.69
2016-09-01	4.72
2016-10-01	5.19
2016-11-01	5.59
2016-12-01	6.02
2017-01-01	6.28
2017-02-01	6.57
2017-03-01	6.78
2017-04-01	6.93
2017-05-01	7.05
2017-06-01	7.31
2017-07-01	7.38
2017-08-01	7.39
2017-09-01	7.39
2017-10-01	7.40
2017-11-01	7.41
2017-12-01	7.56
2018-01-01	7.70
2018-02-01	7.84
2018-03-01	7.86
2018-04-01	7.86
2018-05-01	7.89
2018-06-01	8.02
2018-07-01	8.15
2018-08-01	8.14
2018-09-01	8.17
2018-10-01	8.17