Monthly Percent
1983-06-30 19.9
1983-07-31 19.9
1983-08-31 20
1983-09-30 19.9
1983-10-31 19.6
1983-11-30 19.4
1983-12-31 19.1
1984-01-31 18.9
1984-02-29 18.9
1984-03-31 18.6
1984-04-30 18.8
1984-05-31 19.2
1984-06-30 19.7
1984-07-31 20.3
1984-08-31 21
1984-09-30 21.3
1984-10-31 21.6
1984-11-30 21.6
1984-12-31 21.4
1985-01-31 21.2
1985-02-28 20.9
1985-03-31 20.7
1985-04-30 20.3
1985-05-31 19.8
1985-06-30 19.2
1985-07-31 18.6
1985-08-31 17.9
1985-09-30 17.5
1985-10-31 17.4
1985-11-30 17.6
1985-12-31 17.8
1986-01-31 18
1986-02-28 18
1986-03-31 18
1986-04-30 18.1
1986-05-31 18.3
1986-06-30 18.7
1986-07-31 19.3
1986-08-31 19.8
1986-09-30 20.4
1986-10-31 20.7
1986-11-30 20.3
1986-12-31 20.1
1987-01-31 19.9
1987-02-28 19.4
1987-03-31 18.9
1987-04-30 18.5
1987-05-31 17.6
1987-06-30 16.9
1987-07-31 16
1987-08-31 15.1
1987-09-30 14.3
1987-10-31 13.6
1987-11-30 13.4
1987-12-31 13.2
1988-01-31 13.1
1988-02-29 13.4
1988-03-31 14.2
1988-04-30 14.5
1988-05-31 15.2
1988-06-30 16
1988-07-31 16.9
1988-08-31 17.9
1988-09-30 18.4
1988-10-31 18.7
1988-11-30 18.8
1988-12-31 18.8
1989-01-31 18.9
1989-02-28 18.8
1989-03-31 18.3
1989-04-30 18.1
1989-05-31 17.9
1989-06-30 17.5
1989-07-31 17
1989-08-31 16.6
1989-09-30 17.1
1989-10-31 17.4
1989-11-30 17.9
1989-12-31 18.6
1990-01-31 18.9
1990-02-28 19.3
1990-03-31 19.7
1990-04-30 19.9
1990-05-31 19.8
1990-06-30 19.8
1990-07-31 19.8
1990-08-31 19.4
1990-09-30 18.7
1990-10-31 18.2
1990-11-30 17.8
1990-12-31 16.9
1991-01-31 16.4
1991-02-28 15.7
1991-03-31 15.1
1991-04-30 14.6
1991-05-31 14.3
1991-06-30 13.8
1991-07-31 13.5
1991-08-31 13.2
1991-09-30 12.9
1991-10-31 12.6
1991-11-30 12.3
1991-12-31 12.2
1992-01-31 11.9
1992-02-29 11.7
1992-03-31 11.2
1992-04-30 10.9
1992-05-31 10.5
1992-06-30 10.1
1992-07-31 9.8
1992-08-31 9.5
1992-09-30 9
1992-10-31 8.4
1992-11-30 7.6
1992-12-31 7.4
1993-01-31 7
1993-02-28 6.5
1993-03-31 6.4
1993-04-30 6.2
1993-05-31 6.1
1993-06-30 5.8
1993-07-31 5.6
1993-08-31 5.1
1993-09-30 5.2
1993-10-31 5.3
1993-11-30 5.3
1993-12-31 5.1
1994-01-31 5.2
1994-02-28 5.5
1994-03-31 5.4
1994-04-30 5.6
1994-05-31 5.5
1994-06-30 5.7
1994-07-31 5.7
1994-08-31 6
1994-09-30 6.1
1994-10-31 6.1
1994-11-30 6.3
1994-12-31 6.4
1995-01-31 6.2
1995-02-28 6.6
1995-03-31 6.9
1995-04-30 6.6
1995-05-31 6.7
1995-06-30 6.8
1995-07-31 7.1
1995-08-31 6.8
1995-09-30 6.7
1995-10-31 6.7
1995-11-30 6.5
1995-12-31 6.5
1996-01-31 6.8
1996-02-29 6.4
1996-03-31 6.2
1996-04-30 6.3
1996-05-31 6.4
1996-06-30 6.6
1996-07-31 6.2
1996-08-31 6.7
1996-09-30 6.6
1996-10-31 6.8
1996-11-30 7.1
1996-12-31 7.4
1997-01-31 7.4
1997-02-28 7.7
1997-03-31 7.4
1997-04-30 7.3
1997-05-31 7.9
1997-06-30 8.2
1997-07-31 8.5
1997-08-31 8.7
1997-09-30 9.8
1997-10-31 10.1
1997-11-30 9.3
1997-12-31 9.2
1998-01-31 9.5
1998-02-28 9.8
1998-03-31 10.2
1998-04-30 10.8
1998-05-31 10.5
1998-06-30 10.2
1998-07-31 10.3
1998-08-31 10.3
1998-09-30 9.7
1998-10-31 9.5
1998-11-30 10.5
1998-12-31 10.1
1999-01-31 9.9
1999-02-28 9.7
1999-03-31 10.6
1999-04-30 10.8
1999-05-31 10.6
1999-06-30 11.3
1999-07-31 11.8
1999-08-31 11.7
1999-09-30 11.8
1999-10-31 12
1999-11-30 12
1999-12-31 12.6
2000-01-31 12.7
2000-02-29 12.6
2000-03-31 11.9
2000-04-30 11.8
2000-05-31 12
2000-06-30 11.4
2000-07-31 10.7
2000-08-31 10.7
2000-09-30 10.8
2000-10-31 10.3
2000-11-30 11.1
2000-12-31 11
2001-01-31 11.2
2001-02-28 11.5
2001-03-31 11.1
2001-04-30 11.3
2001-05-31 10.9
2001-06-30 10.9
2001-07-31 10.4
2001-08-31 9.8
2001-09-30 8.9
2001-10-31 9.3
2001-11-30 8.5
2001-12-31 8.4
2002-01-31 8
2002-02-28 7.8
2002-03-31 7.6
2002-04-30 7.5
2002-05-31 8.1
2002-06-30 8.4
2002-07-31 9.1
2002-08-31 9.6
2002-09-30 10.2
2002-10-31 10
2002-11-30 10.3
2002-12-31 10.8
2003-01-31 11.5
2003-02-28 11.6
2003-03-31 12
2003-04-30 11.9
2003-05-31 11.9
2003-06-30 12.2
2003-07-31 12.7
2003-08-31 12.9
2003-09-30 13.7
2003-10-31 14.9
2003-11-30 16
2003-12-31 16.1
2004-01-31 16.1
2004-02-29 16.4
2004-03-31 16.4
2004-04-30 16.8
2004-05-31 16.3
2004-06-30 16.3
2004-07-31 16.3
2004-08-31 16.6
2004-09-30 16.1
2004-10-31 14.6
2004-11-30 13
2004-12-31 12.7
2005-01-31 12.1
2005-02-28 11.6
2005-03-31 11.3
2005-04-30 10.8
2005-05-31 10.9
2005-06-30 10.4
2005-07-31 9.8
2005-08-31 9.8
2005-09-30 9.8
2005-10-31 9.8
2005-11-30 10.3
2005-12-31 10.4
2006-01-31 10.6
2006-02-28 10.6
2006-03-31 11
2006-04-30 11
2006-05-31 10.8
2006-06-30 11.7
2006-07-31 11.3
2006-08-31 11.6
2006-09-30 11.8
2006-10-31 13.5
2006-11-30 13.8
2006-12-31 12.6
2007-01-31 13
2007-02-28 13.2
2007-03-31 12.9
2007-04-30 12.9
2007-05-31 12.8
2007-06-30 12.3
2007-07-31 12.3
2007-08-31 11.6
2007-09-30 11.3
2007-10-31 10.1
2007-11-30 9.4
2007-12-31 10.2
2008-01-31 9.7
2008-02-29 9.7
2008-03-31 9.7
2008-04-30 9.5
2008-05-31 9.1
2008-06-30 7.5
2008-07-31 7
2008-08-31 6.2
2008-09-30 11.6
2008-10-31 11.1
2008-11-30 11
2008-12-31 13.5
2009-01-31 12.3
2009-02-28 11.3
2009-03-31 10.1
2009-04-30 9.1
2009-05-31 8.7
2009-06-30 8.6
2009-07-31 8.1
2009-08-31 7.8
2009-09-30 1.5
2009-10-31 0.8
2009-11-30 -1.8
2009-12-31 -4.6