Month	Percent
1997-07-31	20
1997-08-31	17.9
1997-09-30	18.8
1997-10-31	15.4
1997-11-30	17.5
1997-12-31	22.3
1998-01-31	17.3
1998-02-28	19.3
1998-03-31	16.8
1998-04-30	19
1998-05-31	15.8
1998-06-30	13.9
1998-07-31	17.3
1998-08-31	18.4
1998-09-30	16.9
1998-10-31	19.2
1998-11-30	11.6
1998-12-31	9.9
1999-01-31	9.7
1999-02-28	8.2
1999-03-31	8.4
1999-04-30	8.1
1999-05-31	6
1999-06-30	10.4
1999-07-31	4.3
1999-08-31	8.2
1999-09-30	5.3
1999-10-31	6.6
1999-11-30	11.7
1999-12-31	12.2
2000-01-31	9.7
2000-02-29	9
2000-03-31	14.4
2000-04-30	11.1
2000-05-31	15.5
2000-06-30	12.5
2000-07-31	13.9
2000-08-31	18.1
2000-09-30	17.9
2000-10-31	19.1
2000-11-30	19.2
2000-12-31	19.3
2001-01-31	19.5
2001-02-28	18.9
2001-03-31	17.4
2001-04-30	14.7
2001-05-31	13.2
2001-06-30	16.3
2001-07-31	14.9
2001-08-31	11.3
2001-09-30	11.2
2001-10-31	10.7
2001-11-30	7.2
2001-12-31	4.3
2002-01-31	6.4
2002-02-28	4.1
2002-03-31	1.6
2002-04-30	3
2002-05-31	2.9
2002-06-30	2.7
2002-07-31	0.7
2002-08-31	-1.7
2002-09-30	5.9
2002-10-31	5.1
2002-11-30	6.3
2002-12-31	4.4
2003-01-31	2.7
2003-02-28	4.1
2003-03-31	3.9
2003-04-30	7.8
2003-05-31	6.9
2003-06-30	4.4
2003-07-31	7.6
2003-08-31	5.4
2003-09-30	3.1
2003-10-31	5.4
2003-11-30	4.8
2003-12-31	9.6
2004-01-31	13.3
2004-02-29	9.8
2004-03-31	12
2004-04-30	12.7
2004-05-31	12.1
2004-06-30	13.5
2004-07-31	15.4
2004-08-31	19.3
2004-09-30	19
2004-10-31	16.4
2004-11-30	17
2004-12-31	18
2005-01-31	16
2005-02-28	19.1
2005-03-31	17
2005-04-30	14.7
2005-05-31	16.7
2005-06-30	14
2005-07-31	15.1
2005-08-31	12.4
2005-09-30	13.1
2005-10-31	13.7
2005-11-30	9.2
2005-12-31	12.8
2006-01-31	15.2
2006-02-28	16.6
2006-03-31	19.1
2006-04-30	25.4
2006-05-31	24
2006-06-30	30
2006-07-31	26.5
2006-08-31	28.4
2006-09-30	25.3
2006-10-31	23.9
2006-11-30	30.8
2006-12-31	23.2
2007-01-31	25.6
2007-02-28	23.6
2007-03-31	21.4
2007-04-30	17.6
2007-05-31	21.9
2007-06-30	17.4
2007-07-31	19.3
2007-08-31	23.4
2007-09-30	26.6
2007-10-31	25.7
2007-11-30	24.6
2007-12-31	28.1
2008-01-31	26.3
2008-02-29	24.9
2008-03-31	24.5
2008-04-30	29
2008-05-31	22
2008-06-30	29.5
2008-07-31	32.4
2008-08-31	32.8
2008-09-30	34.5
2008-10-31	45.6
2008-11-30	45.5
2008-12-31	51.1
2009-01-31	49.5
2009-02-28	53.8
2009-03-31	55.8
2009-04-30	45.1
2009-05-31	46.9
2009-06-30	35.4
2009-07-31	31.4
2009-08-31	25.9
2009-09-30	22.9
2009-10-31	17.7
2009-11-30	14.4
2009-12-31	7.7
2010-01-31	6.4
2010-02-28	2.4
2010-03-31	0.7
2010-04-30	0.6
2010-05-31	1.1
2010-06-30	3.1
2010-07-31	0.6
2010-08-31	-2.4
2010-09-30	-2.6
2010-10-31	-3.5
2010-11-30	-4.3
2010-12-31	-7.2
2011-01-31	-9.1
2011-02-28	-7.2
2011-03-31	-7.1
2011-04-30	-3.5
2011-05-31	-4.6
2011-06-30	-4.6
2011-07-31	-3.8
2011-08-31	0.2
2011-09-30	-2.7
2011-10-31	-9
2011-11-30	-8.3
2011-12-31	-4.9
2012-01-31	-7.2
2012-02-29	-10
2012-03-31	-12.4
2012-04-30	-13.4
2012-05-31	-13.7
2012-06-30	-17.8
2012-07-31	-17.6
2012-08-31	-18.8
2012-09-30	-17.5
2012-10-31	-14.4
2012-11-30	-12.5
2012-12-31	-8
2013-01-31	-7.1
2013-02-28	-5.3
2013-03-31	-5.5
2013-04-30	-6.8
2013-05-31	-6
2013-06-30	-3.1
2013-07-31	-2.2
2013-08-31	0.1
2013-09-30	0
2013-10-31	-2.5
2013-11-30	-2.4
2013-12-31	-10.9
2014-01-31	-11
2014-02-28	-10.3
2014-03-31	-15.2
2014-04-30	-17.1
2014-05-31	-17
2014-06-30	-15.7
2014-07-31	-15.2
2014-08-31	-17.6
2014-09-30	-18.9
2014-10-31	-18.3
2014-11-30	-20.1
2014-12-31	-15.7
2015-01-31	-15.9
2015-02-28	-16.4
2015-03-31	-9