Month	Percent
1998-04-01	12.1
1998-05-01	11.0
1998-06-01	10.0
1998-07-01	8.9
1998-08-01	8.6
1998-09-01	9.0
1998-10-01	9.8
1998-11-01	10.6
1998-12-01	11.0
1999-01-01	11.6
1999-02-01	11.7
1999-03-01	11.7
1999-04-01	11.1
1999-05-01	10.9
1999-06-01	10.8
1999-07-01	11.3
1999-08-01	11.7
1999-09-01	12.1
1999-10-01	12.3
1999-11-01	12.5
1999-12-01	12.4
2000-01-01	12.2
2000-02-01	12.1
2000-03-01	12.0
2000-04-01	12.0
2000-05-01	12.1
2000-06-01	12.4
2000-07-01	13.0
2000-08-01	13.3
2000-09-01	13.3
2000-10-01	12.9
2000-11-01	13.0
2000-12-01	13.5
2001-01-01	14.4
2001-02-01	14.6
2001-03-01	14.4
2001-04-01	13.6
2001-05-01	13.0
2001-06-01	12.8
2001-07-01	12.8
2001-08-01	13.2
2001-09-01	13.6
2001-10-01	14.3
2001-11-01	14.7
2001-12-01	14.7
2002-01-01	14.3
2002-02-01	13.8
2002-03-01	13.3
2002-04-01	12.7
2002-05-01	12.0
2002-06-01	11.4
2002-07-01	10.6
2002-08-01	10.5
2002-09-01	10.6
2002-10-01	11.2
2002-11-01	11.7
2002-12-01	11.7
2003-01-01	11.6
2003-02-01	11.5
2003-03-01	11.6
2003-04-01	11.7
2003-05-01	11.5
2003-06-01	10.9
2003-07-01	10.2
2003-08-01	9.9
2003-09-01	9.5
2003-10-01	9.6
2003-11-01	10.2
2003-12-01	10.8
2004-01-01	11.3
2004-02-01	11.5
2004-03-01	11.5
2004-04-01	11.2
2004-05-01	10.8
2004-06-01	10.2
2004-07-01	9.6
2004-08-01	9.4
2004-09-01	9.5
2004-10-01	10.4
2004-11-01	10.6
2004-12-01	10.5
2005-01-01	9.8
2005-02-01	9.2
2005-03-01	9.0
2005-04-01	8.7
2005-05-01	8.5
2005-06-01	8.1
2005-07-01	8.1
2005-08-01	7.9
2005-09-01	7.4
2005-10-01	7.0
2005-11-01	6.6
2005-12-01	6.3
2006-01-01	5.6
2006-02-01	5.2
2006-03-01	5.2
2006-04-01	5.3
2006-05-01	5.3
2006-06-01	5.4
2006-07-01	5.6
2006-08-01	5.7
2006-09-01	5.4
2006-10-01	4.9
2006-11-01	4.7
2006-12-01	4.9
2007-01-01	4.9
2007-02-01	4.8
2007-03-01	4.6
2007-04-01	4.3
2007-05-01	3.8
2007-06-01	3.5
2007-07-01	3.6
2007-08-01	3.5
2007-09-01	3.3
2007-10-01	3.0
2007-11-01	3.2
2007-12-01	3.9
2008-01-01	4.8
2008-02-01	4.9
2008-03-01	4.6
2008-04-01	3.6
2008-05-01	3.3
2008-06-01	3.5
2008-07-01	4.3
2008-08-01	5.1
2008-09-01	5.3
2008-10-01	5.9
2008-11-01	6.5
2008-12-01	7.1
2009-01-01	8.0
2009-02-01	8.8
2009-03-01	9.5
2009-04-01	9.9
2009-05-01	10.0
2009-06-01	9.6
2009-07-01	8.8
2009-08-01	8.7
2009-09-01	9.0
2009-10-01	10.0
2009-11-01	10.8
2009-12-01	11.4
2010-01-01	12.0
2010-02-01	12.3
2010-03-01	12.4
2010-04-01	12.9
2010-05-01	13.0
2010-06-01	13.3
2010-07-01	13.8
2010-08-01	13.8
2010-09-01	13.7
2010-10-01	13.7
2010-11-01	13.5
2010-12-01	13.6
2011-01-01	13.2
2011-02-01	12.9
2011-03-01	12.5
2011-04-01	11.8
2011-05-01	11.5
2011-06-01	11.4
2011-07-01	11.8
2011-08-01	11.6
2011-09-01	11.2
2011-10-01	11.0
2011-11-01	10.8
2011-12-01	11.2
2012-01-01	11.6
2012-02-01	11.7
2012-03-01	11.7
2012-04-01	11.2
2012-05-01	10.5
2012-06-01	10.2
2012-07-01	9.5
2012-08-01	9.5
2012-09-01	9.9
2012-10-01	10.6
2012-11-01	11.3
2012-12-01	11.2
2013-01-01	10.9
2013-02-01	10.5
2013-03-01	10.4
2013-04-01	9.6
2013-05-01	9.1
2013-06-01	9.2
2013-07-01	8.9
2013-08-01	9.2
2013-09-01	9.0
2013-10-01	9.4
2013-11-01	10.1
2013-12-01	10.5
2014-01-01	10.2
2014-02-01	10.0
2014-03-01	9.7
2014-04-01	8.8
2014-05-01	8.4
2014-06-01	8.3
2014-07-01	7.4
2014-08-01	7.3
2014-09-01	7.0
2014-10-01	7.6
2014-11-01	8.3
2014-12-01	8.7
2015-01-01	8.5
2015-02-01	8.3
2015-03-01	8.2
2015-04-01	7.7
2015-05-01	7.1
2015-06-01	7.1
2015-07-01	6.7
2015-08-01	6.8
2015-09-01	6.6
2015-10-01	7.2
2015-11-01	7.6
2015-12-01	8.1
2016-01-01	7.0
2016-02-01	6.5
2016-03-01	6.3
2016-04-01	5.9
2016-05-01	6.0
2016-06-01	6.2
2016-07-01	6.2
2016-08-01	6.2
2016-09-01	6.0
2016-10-01	5.8
2016-11-01	6.0
2016-12-01	6.6
2017-01-01	5.8
2017-02-01	5.5
2017-03-01	5.4
2017-04-01	5.1
2017-05-01	4.8
2017-06-01	5.1
2017-07-01	5.1
2017-08-01	5.2
2017-09-01	5.3
2017-10-01	5.0
2017-11-01	5.1
2017-12-01	5.9
2018-01-01	5.3
2018-02-01	5.2
2018-03-01	5.3
2018-04-01	5.0
2018-05-01	4.8
2018-06-01	5.2
2018-07-01	5.3
2018-08-01	5.3
2018-09-01	5.3