Monthly 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