| 年月 | 单位：% |
| 2010-02 | 23.63 |
| 2009-12 | 10.45 |
| 2009-11 | 10.42 |
| 2009-10 | 9.75 |
| 2009-09 | 9.00 |
| 2009-08 | 8.70 |
| 2009-07 | 8.10 |
| 2009-06 | 8.10 |
| 2009-05 | 6.80 |
| 2009-04 | 6.60 |
| 2009-03 | 6.80 |
| 2009-02 | 4.50 |
| 2008-12 | 12.00 |
| 2008-11 | 12.42 |
| 2008-10 | 12.74 |
| 2008-09 | 13.20 |
| 2008-08 | 13.65 |
| 2008-07 | 13.61 |
| 2008-06 | 13.60 |
| 2008-05 | 14.60 |
| 2008-04 | 13.23 |
| 2008-03 | 13.40 |
| 2008-02 | 12.18 |
| 2007-12 | 9.29 |
| 2007-11 | 9.94 |
| 2007-10 | 9.95 |
| 2007-09 | 10.37 |
| 2007-08 | 10.05 |
| 2007-07 | 9.89 |
| 2007-06 | 9.65 |
| 2007-05 | 10.13 |
| 2007-04 | 11.33 |
| 2007-03 | 12.08 |
| 2007-02 | 12.78 |
| 2006-12 | 9.97 |
| 2006-11 | 9.94 |
| 2006-10 | 10.20 |
| 2006-09 | 9.98 |
| 2006-08 | 10.34 |
| 2006-07 | 10.80 |
| 2006-06 | 11.35 |
| 2006-05 | 11.77 |
| 2006-04 | 12.20 |
| 2006-03 | 11.07 |
| 2006-02 | 9.45 |
| 2005-12 | 10.58 |
| 2005-11 | 10.37 |
| 2005-10 | 10.41 |
| 2005-09 | 10.38 |
| 2005-08 | 10.25 |
| 2005-07 | 10.32 |
| 2005-06 | 10.14 |
| 2005-05 | 9.40 |
| 2005-04 | 8.96 |
| 2005-03 | 9.30 |
| 2005-02 | 11.04 |
| 2005-01 | 22.37 |
| 2004-12 | 13.22 |
| 2004-11 | 13.58 |
| 2004-10 | 13.70 |
| 2004-09 | 13.46 |
| 2004-08 | 12.86 |
| 2004-07 | 12.43 |
| 2004-06 | 12.51 |
| 2004-05 | 13.06 |
| 2004-04 | 12.98 |
| 2004-03 | 11.44 |
| 2004-02 | 11.05 |
| 2004-01 | 3.41 |
| 2003-12 | 13.55 |
| 2003-11 | 13.21 |
| 2003-10 | 12.95 |
| 2003-09 | 12.65 |
| 2003-08 | 12.74 |
| 2003-07 | 13.19 |
| 2003-06 | 12.59 |
| 2003-05 | 11.58 |
| 2003-04 | 10.96 |
| 2003-03 | 11.53 |
| 2003-02 | 10.43 |
| 2003-01 | 9.09 |
| 2002-12 | 12.67 |
| 2002-11 | 12.45 |
| 2002-10 | 12.83 |
| 2002-09 | 13.32 |
| 2002-08 | 13.10 |
| 2002-07 | 12.90 |
| 2002-06 | 12.50 |
| 2002-05 | 12.50 |
| 2002-04 | 12.33 |
| 2002-03 | 12.70 |
| 2002-02 | 14.38 |
| 2002-01 | 23.40 |
| 2001-12 | 8.24 |
| 2001-11 | 8.13 |
| 2001-10 | 7.99 |
| 2001-09 | 7.79 |
| 2001-08 | 7.75 |
| 2001-07 | 7.81 |
| 2001-06 | 8.33 |
| 2001-05 | 8.54 |
| 2001-04 | 7.10 |
| 2001-03 | 6.30 |
| 2001-02 | 9.50 |
| 2001-01 | -2.50 |
| 2000-12 | 1.10 |
| 2000-11 | 1.50 |
| 2000-10 | 1.50 |
| 2000-09 | 1.20 |
| 2000-08 | 1.00 |
| 2000-07 | 0.70 |
| 2000-06 | 0.80 |
| 2000-05 | -0.30 |
| 2000-04 | -0.40 |
| 2000-03 | -1.90 |
| 2000-02 | -6.50 |
| 1999-12 | -7.78 |
| 1999-11 | -6.64 |
| 1999-10 | -5.84 |
| 1999-09 | -5.58 |
| 1999-08 | -5.36 |
| 1999-07 | -5.69 |
| 1999-06 | -6.28 |
| 1999-05 | -5.02 |
| 1999-04 | -3.32 |
| 1999-03 | -0.65 |
| 1999-02 | 5.14 |
| 1999-01 | 12.46 |
| 1998-12 | -3.80 |
| 1998-11 | -3.30 |
| 1998-10 | -4.40 |
| 1998-09 | -5.10 |
| 1998-08 | -5.50 |
| 1998-07 | -5.40 |
| 1998-06 | -5.50 |
| 1998-05 | -7.10 |
| 1998-04 | -8.10 |
| 1998-03 | -9.30 |
| 1998-02 | -12.40 |
| 1998-01 | -12.30 |
| 1997-12 | 2.00 |
| 1997-11 | 2.00 |
| 1997-10 | 2.00 |
| 1997-09 | 2.20 |
| 1997-08 | 2.50 |
| 1997-07 | 2.30 |
| 1997-06 | 2.30 |
| 1997-05 | 3.50 |
| 1997-04 | 3.80 |
| 1997-03 | 6.20 |
| 1997-02 | 4.20 |
| 1997-01 | 2.10 |
| 1995-12 | 5.50 |
| 1995-11 | 5.40 |
| 1995-10 | 5.70 |
| 1995-09 | 5.56 |
| 1995-08 | 5.90 |
| 1995-07 | 6.81 |
| 1995-06 | 6.81 |
| 1995-05 | 6.56 |
| 1995-04 | 8.02 |
| 1995-03 | 8.91 |
| 1995-02 | 10.81 |
| 1995-01 | -1.67 |
| 1993-12 | 4.30 |
| 1993-11 | 3.80 |
| 1993-10 | 3.70 |
| 1993-09 | 3.60 |
| 1993-08 | 5.00 |
| 1993-07 | 4.30 |
| 1993-06 | 4.20 |
| 1993-05 | 4.30 |
| 1993-04 | 4.70 |
| 1993-03 | 4.00 |
| 1993-02 | 0.70 |
| 1993-01 | -12.80 |
| 1992-12 | 2.90 |
| 1992-11 | 3.00 |
| 1992-10 | 2.80 |
| 1992-09 | 3.10 |
| 1992-08 | 2.80 |
| 1992-07 | 2.10 |
| 1992-06 | 1.40 |
| 1992-05 | 0.40 |
| 1992-04 | -0.40 |
| 1992-03 | -0.70 |
| 1992-02 | -1.90 |
| 1992-01 | -1.30 |
| 1991-12 | 0.80 |
| 1991-11 | 0.60 |
| 1991-10 | 0.70 |
| 1991-09 | 0.30 |
| 1991-08 | -0.10 |
| 1991-07 | -0.20 |
| 1991-06 | -0.30 |
| 1991-05 | -0.10 |
| 1991-04 | -0.40 |
| 1991-03 | 0.10 |
| 1991-02 | 3.30 |
| 1991-01 | 12.60 |
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