Month	Percent
1997-06-01	9.15
1997-07-01	9.42
1997-08-01	9.62
1997-09-01	9.43
1997-10-01	9.30
1997-11-01	10.76
1997-12-01	10.48
1998-01-01	11.03
1998-02-01	11.03
1998-03-01	9.27
1998-04-01	8.11
1998-05-01	7.85
1998-06-01	7.74
1998-07-01	7.67
1998-08-01	7.56
1998-09-01	8.25
1998-10-01	8.45
1998-11-01	7.65
1998-12-01	7.17
1999-01-01	6.30
1999-02-01	6.00
1999-03-01	6.00
1999-04-01	5.90
1999-05-01	5.80
1999-06-01	6.00
1999-07-01	6.40
1999-08-01	6.70
1999-09-01	6.60
1999-10-01	7.00
1999-11-01	6.60
1999-12-01	6.40
2000-01-01	6.60
2000-02-01	6.50
2000-03-01	6.20
2000-04-01	6.10
2000-05-01	6.20
2000-06-01	6.10
2000-07-01	6.10
2000-08-01	6.00
2000-09-01	6.10
2000-10-01	6.00
2000-11-01	5.90
2000-12-01	5.50
2001-01-01	5.35
2001-02-01	5.35
2001-03-01	5.28
2001-04-01	5.39
2001-05-01	5.54
2001-06-01	5.48
2001-07-01	5.52
2001-08-01	5.33
2001-09-01	5.31
2001-10-01	5.07
2001-11-01	4.90
2001-12-01	5.13
2002-01-01	5.24
2002-02-01	5.31
2002-03-01	5.51
2002-04-01	5.51
2002-05-01	5.52
2002-06-01	5.36
2002-07-01	5.21
2002-08-01	4.95
2002-09-01	4.73
2002-10-01	4.79
2002-11-01	4.76
2002-12-01	4.58
2003-01-01	4.43
2003-02-01	4.24
2003-03-01	4.26
2003-04-01	4.38
2003-05-01	4.02
2003-06-01	3.81
2003-07-01	4.12
2003-08-01	4.29
2003-09-01	4.32
2003-10-01	4.38
2003-11-01	4.51
2003-12-01	4.45
2004-01-01	4.37
2004-02-01	4.35
2004-03-01	4.17
2004-04-01	4.35
2004-05-01	4.49
2004-06-01	4.55
2004-07-01	4.44
2004-08-01	4.28
2004-09-01	4.22
2004-10-01	4.11
2004-11-01	3.97
2004-12-01	3.77
2005-01-01	3.69
2005-02-01	3.69
2005-03-01	3.92
2005-04-01	3.76
2005-05-01	3.60
2005-06-01	3.44
2005-07-01	3.46
2005-08-01	3.47
2005-09-01	3.30
2005-10-01	3.45
2005-11-01	3.67
2005-12-01	3.57
2006-01-01	3.60
2006-02-01	3.77
2006-03-01	3.95
2006-04-01	4.23
2006-05-01	4.30
2006-06-01	4.31
2006-07-01	4.33
2006-08-01	4.19
2006-09-01	4.06
2006-10-01	4.08
2006-11-01	3.98
2006-12-01	4.04
2007-01-01	4.28
2007-02-01	4.30
2007-03-01	4.20
2007-04-01	4.40
2007-05-01	4.51
2007-06-01	4.80
2007-07-01	4.79
2007-08-01	4.62
2007-09-01	4.56
2007-10-01	4.58
2007-11-01	4.43
2007-12-01	4.53
2008-01-01	4.40
2008-02-01	4.36
2008-03-01	4.42
2008-04-01	4.54
2008-05-01	4.74
2008-06-01	5.17
2008-07-01	5.15
2008-08-01	4.87
2008-09-01	4.88
2008-10-01	4.93
2008-11-01	5.09
2008-12-01	5.08
2009-01-01	5.60
2009-02-01	5.70
2009-03-01	5.87
2009-04-01	5.50
2009-05-01	5.22
2009-06-01	5.33
2009-07-01	4.89
2009-08-01	4.52
2009-09-01	4.56
2009-10-01	4.57
2009-11-01	4.84
2009-12-01	5.49
2010-01-01	6.02
2010-02-01	6.46
2010-03-01	6.24
2010-04-01	7.83
2010-05-01	7.97
2010-06-01	9.10
2010-07-01	10.34
2010-08-01	10.70
2010-09-01	11.34
2010-10-01	9.57
2010-11-01	11.52
2010-12-01	12.01
2011-01-01	11.73
2011-02-01	11.40
2011-03-01	12.44
2011-04-01	13.86
2011-05-01	15.94
2011-06-01	16.69
2011-07-01	16.15
2011-08-01	15.90
2011-09-01	17.78
2011-10-01	18.04
2011-11-01	17.92
2011-12-01	21.14
2012-01-01	25.91
2012-02-01	29.24
2012-03-01	19.06
2012-04-01	21.48
2012-05-01	26.90
2012-06-01	27.82
2012-07-01	25.82
2012-08-01	24.34
2012-09-01	20.91
2012-10-01	17.96
2012-11-01	17.20
2012-12-01	13.33
2013-01-01	11.10
2013-02-01	10.95
2013-03-01	11.38
2013-04-01	11.58
2013-05-01	9.07
2013-06-01	10.07
2013-07-01	10.53
2013-08-01	10.01
2013-09-01	10.15
2013-10-01	8.74
2013-11-01	8.41
2013-12-01	8.66
2014-01-01	8.18
2014-02-01	7.70
2014-03-01	6.90
2014-04-01	6.20
2014-05-01	6.38
2014-06-01	5.93
2014-07-01	6.10
2014-08-01	6.09
2014-09-01	5.89
2014-10-01	7.26
2014-11-01	8.10
2014-12-01	8.42
2015-01-01	9.48
2015-02-01	9.72
2015-03-01	10.52
2015-04-01	12.00
2015-05-01	10.95
2015-06-01	11.43
2015-08-01	10.26
2015-09-01	8.54
2015-10-01	7.81
2015-11-01	7.41
2015-12-01	8.21
2016-01-01	9.08
2016-02-01	10.41
2016-03-01	9.12
2016-04-01	9.03
2016-05-01	7.64
2016-06-01	7.92
2016-07-01	7.99
2016-08-01	8.19
2016-09-01	8.34
2016-10-01	8.33
2016-11-01	7.33
2016-12-01	6.94
2017-01-01	7.04
2017-02-01	7.52
2017-03-01	7.17
2017-04-01	6.70
2017-05-01	5.86
2017-06-01	5.76
2017-07-01	5.33
2017-08-01	5.55
2017-09-01	5.56
2017-10-01	5.59
2017-11-01	5.22
2017-12-01	4.44
2018-01-01	3.79
2018-02-01	4.14
2018-03-01	4.27
2018-04-01	4.04
2018-05-01	4.29
2018-06-01	4.39
2018-07-01	3.88
2018-08-01	4.18
2018-09-01	4.17