Month	Percent
1997-07-31	5.8
1997-08-31	5.6
1997-09-30	4.5
1997-10-31	3.1
1997-11-30	2.4
1997-12-31	2.6
1998-01-31	3
1998-02-28	5.7
1998-03-31	5.2
1998-04-30	5
1998-05-31	5.1
1998-06-30	4.3
1998-07-31	3.9
1998-08-31	4.4
1998-09-30	5.6
1998-10-31	5.2
1998-11-30	6.6
1998-12-31	6.4
1999-01-31	6.8
1999-02-28	4.6
1999-03-31	5.6
1999-04-30	6.3
1999-05-31	5
1999-06-30	4.7
1999-07-31	4.4
1999-08-31	3.7
1999-09-30	4.3
1999-10-31	4.1
1999-11-30	3.3
1999-12-31	5.6
2000-01-31	4.7
2000-02-29	6.4
2000-03-31	8.9
2000-04-30	10.5
2000-05-31	13.5
2000-06-30	12.9
2000-07-31	14.2
2000-08-31	16.2
2000-09-30	16.9
2000-10-31	15.8
2000-11-30	14.2
2000-12-31	12.6
2001-01-31	13.7
2001-02-28	12.1
2001-03-31	10.8
2001-04-30	8.7
2001-05-31	5.2
2001-06-30	8.8
2001-07-31	7.7
2001-08-31	7
2001-09-30	6.1
2001-10-31	7.2
2001-11-30	8.4
2001-12-31	7.6
2002-01-31	6
2002-02-28	5.1
2002-03-31	5
2002-04-30	4.3
2002-05-31	5.8
2002-06-30	3
2002-07-31	2.9
2002-08-31	3.9
2002-09-30	3.4
2002-10-31	4.3
2002-11-30	5.2
2002-12-31	7
2003-01-31	7.2
2003-02-28	8
2003-03-31	8.2
2003-04-30	9.2
2003-05-31	9.3
2003-06-30	11
2003-07-31	11.1
2003-08-31	9.2
2003-09-30	9
2003-10-31	8
2003-11-30	8
2003-12-31	6.8
2004-01-31	8.6
2004-02-29	8.9
2004-03-31	6.5
2004-04-30	6.1
2004-05-31	6.2
2004-06-30	4.9
2004-07-31	6.7
2004-08-31	6.9
2004-09-30	8.6
2004-10-31	8.8
2004-11-30	5.6
2004-12-31	7.1
2005-01-31	8.2
2005-02-28	7.6
2005-03-31	10.6
2005-04-30	12.4
2005-05-31	12.7
2005-06-30	15.8
2005-07-31	15.7
2005-08-31	15.5
2005-09-30	15.9
2005-10-31	15.5
2005-11-30	18.8
2005-12-31	17.8
2006-01-31	15.2
2006-02-28	15.3
2006-03-31	17.1
2006-04-30	16.2
2006-05-31	16.7
2006-06-30	15.9
2006-07-31	17.7
2006-08-31	19.2
2006-09-30	18.4
2006-10-31	18
2006-11-30	18.1
2006-12-31	18.9
2007-01-31	19.1
2007-02-28	20.1
2007-03-31	18.8
2007-04-30	18.9
2007-05-31	18.7
2007-06-30	18.1
2007-07-31	17.7
2007-08-31	17.6
2007-09-30	17.2
2007-10-31	18.7
2007-11-30	18.1
2007-12-31	16.9
2008-01-31	15.4
2008-02-29	16.5
2008-03-31	14.9
2008-04-30	14.9
2008-05-31	13.7
2008-06-30	13.4
2008-07-31	11
2008-08-31	10.1
2008-09-30	8.3
2008-10-31	6.7
2008-11-30	5.1
2008-12-31	3.6
2009-01-31	4.6
2009-02-28	3.1
2009-03-31	2.3
2009-04-30	0.1
2009-05-31	0
2009-06-30	-1.7
2009-07-31	-3.3
2009-08-31	-3.5
2009-09-30	-3.5
2009-10-31	-3.4
2009-11-30	-2.8
2009-12-31	-2.4
2010-01-31	-2.8
2010-02-28	-4
2010-03-31	-4.3
2010-04-30	-3.6
2010-05-31	-4.3
2010-06-30	-4
2010-07-31	-3.1
2010-08-31	-3.5
2010-09-30	-3.4
2010-10-31	-3.5
2010-11-30	-3.5
2010-12-31	-3.2
2011-01-31	-3.2
2011-02-28	-2.1
2011-03-31	-2.4
2011-04-30	-1.9
2011-05-31	-2.5
2011-06-30	-1.5
2011-07-31	-1.7
2011-08-31	-2.3
2011-09-30	-1.8
2011-10-31	-2.1
2011-11-30	-2
2011-12-31	-2.8
2012-01-31	-2.9
2012-02-29	-3.7
2012-03-31	-2.8
2012-04-30	-3.3
2012-05-31	-3.2
2012-06-30	-3.7
2012-07-31	-3.9
2012-08-31	-3
2012-09-30	-3.1
2012-10-31	-2.9
2012-11-30	-3.1
2012-12-31	-2.7
2013-01-31	-2
2013-02-28	-2.5
2013-03-31	-2.5
2013-04-30	-2.7
2013-05-31	-2.7
2013-06-30	-3.2
2013-07-31	-2.2
2013-08-31	-2
2013-09-30	-2.1
2013-10-31	-1.2
2013-11-30	-1.2
2013-12-31	-0.6
2014-01-31	-1.3
2014-02-28	-0.5
2014-03-31	-1.5
2014-04-30	-1.2
2014-05-31	0.1
2014-06-30	0.1
2014-07-31	-0.3
2014-08-31	-0.1
2014-09-30	-0.2
2014-10-31	-1.3
2014-11-30	-1.5
2014-12-31	-1.5
2015-01-31	-1.8
2015-02-28	-1.3
2015-03-31	-0.2