Month	Percent
1997-07-31	4.8
1997-08-31	4
1997-09-30	2.4
1997-10-31	2.6
1997-11-30	3.4
1997-12-31	3.5
1998-01-31	2.5
1998-02-28	3.6
1998-03-31	3.8
1998-04-30	5.7
1998-05-31	5.5
1998-06-30	4.6
1998-07-31	4.6
1998-08-31	5.7
1998-09-30	5.8
1998-10-31	4.9
1998-11-30	4.2
1998-12-31	6.3
1999-01-31	6
1999-02-28	6
1999-03-31	7.2
1999-04-30	7.3
1999-05-31	7
1999-06-30	6.7
1999-07-31	7.1
1999-08-31	6.5
1999-09-30	8.4
1999-10-31	9
1999-11-30	10.6
1999-12-31	10.9
2000-01-31	10.9
2000-02-29	11.5
2000-03-31	12.3
2000-04-30	12.7
2000-05-31	13
2000-06-30	14.4
2000-07-31	14.3
2000-08-31	14.3
2000-09-30	16.1
2000-10-31	16.3
2000-11-30	16.3
2000-12-31	15.7
2001-01-31	15.3
2001-02-28	15.2
2001-03-31	13.9
2001-04-30	13.6
2001-05-31	13.3
2001-06-30	11.7
2001-07-31	11.5
2001-08-31	11.6
2001-09-30	10
2001-10-31	10.3
2001-11-30	10.5
2001-12-31	10.3
2002-01-31	10.2
2002-02-28	10.1
2002-03-31	9.9
2002-04-30	10.3
2002-05-31	10.7
2002-06-30	11.3
2002-07-31	11.6
2002-08-31	12.3
2002-09-30	12
2002-10-31	12.3
2002-11-30	11.8
2002-12-31	12.2
2003-01-31	12.6
2003-02-28	12.4
2003-03-31	11.6
2003-04-30	12.1
2003-05-31	12.1
2003-06-30	12
2003-07-31	11.8
2003-08-31	11.4
2003-09-30	11.5
2003-10-31	12
2003-11-30	11.7
2003-12-31	11.2
2004-01-31	10.9
2004-02-29	11.2
2004-03-31	11.2
2004-04-30	11
2004-05-31	11.3
2004-06-30	11.7
2004-07-31	12
2004-08-31	12.4
2004-09-30	12.8
2004-10-31	12.6
2004-11-30	13.2
2004-12-31	10.6
2005-01-31	11.5
2005-02-28	11.5
2005-03-31	12.5
2005-04-30	12.7
2005-05-31	13.1
2005-06-30	14.2
2005-07-31	13.7
2005-08-31	13.4
2005-09-30	13.6
2005-10-31	13.3
2005-11-30	13.9
2005-12-31	17.3
2006-01-31	18.7
2006-02-28	18.1
2006-03-31	17.6
2006-04-30	17.5
2006-05-31	15.8
2006-06-30	15.8
2006-07-31	15.8
2006-08-31	15.8
2006-09-30	16.3
2006-10-31	16.5
2006-11-30	16.4
2006-12-31	16.8
2007-01-31	14.9
2007-02-28	14.5
2007-03-31	14.7
2007-04-30	14.3
2007-05-31	15.3
2007-06-30	14.8
2007-07-31	15.8
2007-08-31	15.7
2007-09-30	14.7
2007-10-31	12.9
2007-11-30	12.2
2007-12-31	10.3
2008-01-31	9.9
2008-02-29	10
2008-03-31	10
2008-04-30	10.5
2008-05-31	10
2008-06-30	10.1
2008-07-31	9.1
2008-08-31	8.5
2008-09-30	7.9
2008-10-31	7.9
2008-11-30	6.9
2008-12-31	6.3
2009-01-31	5.2
2009-02-28	4.6
2009-03-31	2.8
2009-04-30	1.3
2009-05-31	0.6
2009-06-30	-1.2
2009-07-31	-1.7
2009-08-31	-2.5
2009-09-30	-3.2
2009-10-31	-3
2009-11-30	-2.5
2009-12-31	-2.3
2010-01-31	-2.2
2010-02-28	-2.4
2010-03-31	-2.1
2010-04-30	-2.1
2010-05-31	-2.1
2010-06-30	-2.2
2010-07-31	-2.8
2010-08-31	-2.3
2010-09-30	-2.8
2010-10-31	-1.9
2010-11-30	-3.2
2010-12-31	-3.6
2011-01-31	-3.1
2011-02-28	-3.2
2011-03-31	-3.7
2011-04-30	-3.7
2011-05-31	-3.6
2011-06-30	-3.7
2011-07-31	-2.3
2011-08-31	-2.7
2011-09-30	-2
2011-10-31	-3.2
2011-11-30	-2.3
2011-12-31	-2.2
2012-01-31	-2.7
2012-02-29	-3.5
2012-03-31	-3.6
2012-04-30	-3.5
2012-05-31	-3.9
2012-06-30	-4
2012-07-31	-5
2012-08-31	-4.8
2012-09-30	-5.4
2012-10-31	-5.2
2012-11-30	-5.6
2012-12-31	-5.1
2013-01-31	-4.6
2013-02-28	-4
2013-03-31	-3.8
2013-04-30	-4.3
2013-05-31	-4.9
2013-06-30	-4.5
2013-07-31	-5.3
2013-08-31	-4.8
2013-09-30	-4.6
2013-10-31	-4.6
2013-11-30	-5.1
2013-12-31	-6.1
2014-01-31	-6.1
2014-02-28	-5.7
2014-03-31	-6.2
2014-04-30	-5.7
2014-05-31	-5.2
2014-06-30	-5.5
2014-07-31	-4.2
2014-08-31	-4.7
2014-09-30	-4.4
2014-10-31	-4.2
2014-11-30	-3.7
2014-12-31	-3.3
2015-01-31	-3.4
2015-02-28	-3.4
2015-03-31	-3.5