Month	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