Month	Percent
1999-01-31	17.9
1999-02-28	17.97
1999-03-31	17.77
1999-04-30	17.38
1999-05-31	17.15
1999-06-30	17.02
1999-07-31	16.68
1999-08-31	16.68
1999-09-30	16.73
1999-10-31	16.56
1999-11-30	16.73
1999-12-31	16.53
2000-01-31	16.62
2000-02-29	16.66
2000-03-31	16.39
2000-04-30	16.42
2000-05-31	16.46
2000-06-30	16.43
2000-07-31	16.27
2000-08-31	16.27
2000-09-30	15.88
2000-10-31	15.95
2000-11-30	15.89
2000-12-31	15.63
2001-01-31	15.63
2001-02-28	15.76
2001-03-31	15.23
2001-04-30	15.14
2001-05-31	14.93
2001-06-30	14.87
2001-07-31	14.95
2001-08-31	14.96
2001-09-30	15.01
2001-10-31	15.03
2001-11-30	14.98
2001-12-31	15.05
2002-01-31	14.43
2002-02-28	14.55
2002-03-31	14.1
2002-04-30	14.05
2002-05-31	14.01
2002-06-30	13.86
2002-07-31	13.79
2002-08-31	13.81
2002-09-30	13.95
2002-10-31	13.9
2002-11-30	13.99
2002-12-31	13.89
2003-01-31	13.97
2003-02-28	14.14
2003-03-31	13.73
2003-04-30	13.82
2003-05-31	13.73
2003-06-30	13.72
2003-07-31	13.49
2003-08-31	13.63
2003-09-30	13.68
2003-10-31	13.68
2003-11-30	13.78
2003-12-31	13.62
2004-01-31	14.07
2004-02-29	14.69
2004-03-31	14.57
2004-04-30	14.59
2004-05-31	14.16
2004-06-30	14.63
2004-07-31	14.35
2004-08-31	14.5
2004-09-30	14.72
2004-10-31	14.91
2004-11-30	15.3
2004-12-31	14.99
2005-01-31	15.19
2005-02-28	15.09
2005-03-31	14.95
2005-04-30	14.9
2005-05-31	14.82
2005-06-30	14.89
2005-07-31	14.98
2005-08-31	14.83
2005-09-30	15.13
2005-10-31	15.17
2005-11-30	15.31
2005-12-31	15.44
2006-01-31	15.51
2006-02-28	15.68
2006-03-31	15.18
2006-04-30	15.5
2006-05-31	15.66
2006-06-30	15.72
2006-07-31	15.64
2006-08-31	16.32
2006-09-30	16.46
2006-10-31	16.64
2006-11-30	17.02
2006-12-31	16.84
2007-01-31	16.98
2007-02-28	17.09
2007-03-31	16.45
2007-04-30	17.1
2007-05-31	16.87
2007-06-30	17.14
2007-07-31	17.27
2007-08-31	17.25
2007-09-30	17.49
2007-10-31	17.16
2007-11-30	17.73
2007-12-31	17.31
2008-01-31	17.67
2008-02-29	17.77
2008-03-31	17.35
2008-04-30	17.6
2008-05-31	17.46
2008-06-30	17.48
2008-07-31	17.45
2008-08-31	17.54
2008-09-30	17.7
2008-10-31	17.89
2008-11-30	18.01
2008-12-31	17.43
2009-01-31	18.12
2009-02-28	18.13
2009-03-31	17.82
2009-04-30	17.93
2009-05-31	17.95
2009-06-30	17.95
2009-07-31	18
2009-08-31	18.13
2009-09-30	18.28
2009-10-31	18
2009-11-30	18.33
2009-12-31	17.76
2010-01-31	18.36
2010-02-28	18.5
2010-03-31	18.24
2010-04-30	18.5
2010-05-31	18.17
2010-06-30	18.46
2010-07-31	18.43
2010-08-31	18.67
2010-09-30	18.86
2010-10-31	18.52
2010-11-30	18.48
2010-12-31	18.26
2011-01-31	18.77
2011-02-28	18.78
2011-03-31	18.07
2011-04-30	18.36
2011-05-31	18.55
2011-06-30	18.74
2011-07-31	18.24
2011-08-31	18.26
2011-09-30	18.41
2011-10-31	18.11
2011-11-30	18.31
2011-12-31	18.16
2012-01-31	18.46
2012-02-29	18.33
2012-03-31	17.92
2012-04-30	18.1
2012-05-31	17.96
2012-06-30	18.21
2012-07-31	18
2012-08-31	18.07
2012-09-30	18.35
2012-10-31	18.16
2012-11-30	18.25
2012-12-31	17.91
2013-01-31	18.11
2013-02-28	18.94
2013-03-31	17.4
2013-04-30	18.12
2013-05-31	17.86
2013-06-30	18.07
2013-07-31	17.76
2013-08-31	17.85
2013-09-30	18.28
2013-10-31	17.92
2013-11-30	18.03
2013-12-31	17.83
2014-01-31	17.87
2014-02-28	18.41
2014-03-31	17.59
2014-04-30	17.98
2014-05-31	17.81
2014-06-30	17.96
2014-07-31	17.69
2014-08-31	17.79
2014-09-30	18.03
2014-10-31	17.85
2014-11-30	17.99
2014-12-31	17.67
2015-01-31	17.91
2015-02-28	18.63
2015-03-31	17.85
2015-04-30	17.93
2015-05-31	17.89
2015-06-30	18.14
2015-07-31	17.91
2015-08-31	17.99
2015-09-30	18.08
2015-10-31	17.98
2015-11-30	17.97
2015-12-31	17.89