Monthly 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