Month	Percent
2007-01-01	77.76
2007-02-01	79.51
2007-03-01	76.99
2007-04-01	79.26
2007-05-01	78.32
2007-06-01	79.10
2007-07-01	78.77
2007-08-01	77.66
2007-09-01	78.18
2007-10-01	79.88
2007-11-01	79.55
2007-12-01	78.54
2008-01-01	78.71
2008-02-01	78.28
2008-03-01	79.66
2008-04-01	79.70
2008-05-01	78.72
2008-06-01	77.96
2008-07-01	78.19
2008-08-01	78.91
2008-09-01	78.52
2008-10-01	78.54
2008-11-01	78.96
2008-12-01	79.17
2009-01-01	79.00
2009-02-01	80.20
2009-03-01	80.57
2009-04-01	81.19
2009-05-01	81.14
2009-06-01	80.86
2009-07-01	80.89
2009-08-01	79.81
2009-09-01	80.01
2009-10-01	82.30
2009-11-01	81.45
2009-12-01	81.50
2010-01-01	81.72
2010-02-01	80.66
2010-03-01	80.33
2010-04-01	81.04
2010-05-01	80.88
2010-06-01	81.59
2010-07-01	81.13
2010-08-01	81.24
2010-09-01	81.31
2010-10-01	81.67
2010-11-01	81.43
2010-12-01	82.34
2011-01-01	81.44
2011-02-01	81.12
2011-03-01	81.54
2011-04-01	81.12
2011-05-01	81.74
2011-06-01	81.68
2011-07-01	81.48
2011-08-01	80.71
2011-09-01	81.37
2011-10-01	83.58
2011-11-01	82.53
2011-12-01	83.10
2012-01-01	81.84
2012-02-01	81.97
2012-03-01	82.23
2012-04-01	81.60
2012-05-01	82.39
2012-06-01	82.45
2012-07-01	82.02
2012-08-01	82.77
2012-09-01	81.43
2012-10-01	82.60
2012-11-01	82.02
2012-12-01	81.96
2013-01-01	82.16
2013-02-01	81.76
2013-03-01	80.92
2013-04-01	80.43
2013-05-01	82.43
2013-06-01	80.80
2013-07-01	81.35
2013-08-01	81.51
2013-09-01	81.27
2013-10-01	82.22
2013-11-01	81.38
2013-12-01	82.18
2014-01-01	81.75
2014-02-01	81.19
2014-03-01	80.90
2014-04-01	80.84
2014-05-01	81.78
2014-06-01	81.31
2014-07-01	81.14
2014-08-01	81.63
2014-09-01	81.71
2014-10-01	82.98
2014-11-01	82.28
2014-12-01	82.09
2015-01-01	81.68
2015-02-01	81.55
2015-03-01	81.05
2015-04-01	81.68
2015-05-01	81.70
2015-06-01	80.85
2015-07-01	81.79
2015-08-01	81.32
2015-09-01	80.57
2015-10-01	82.59
2015-11-01	82.20
2015-12-01	82.50
2016-01-01	81.58
2016-02-01	81.26
2016-03-01	80.18
2016-04-01	81.53
2016-05-01	80.31
2016-06-01	81.50
2016-07-01	80.33
2016-08-01	81.64
2016-09-01	80.38
2016-10-01	81.79
2016-11-01	81.46
2016-12-01	81.96
2017-01-01	81.77
2017-02-01	80.62
2017-03-01	80.51
2017-04-01	80.77
2017-05-01	80.75
2017-06-01	81.17
2017-07-01	80.69
2017-08-01	81.17
2017-09-01	80.33
2017-10-01	81.04
2017-11-01	81.54
2017-12-01	80.82
2018-01-01	80.39
2018-02-01	80.36
2018-03-01	80.06
2018-04-01	80.23
2018-05-01	80.70
2018-06-01	81.08
2018-07-01	80.76