| 年月 | 单位：% |
| 2009-12 | 19.92 |
| 2009-11 | 18.72 |
| 2009-10 | 16.38 |
| 2009-09 | 9.90 |
| 2009-08 | 11.90 |
| 2009-07 | 11.90 |
| 2009-06 | 13.30 |
| 2009-05 | 8.90 |
| 2009-04 | 7.30 |
| 2009-03 | 9.70 |
| 2009-02 | 13.50 |
| 2008-12 | 1.05 |
| 2008-11 | 7.65 |
| 2008-10 | 7.62 |
| 2008-09 | 9.16 |
| 2008-08 | 11.54 |
| 2008-07 | 10.82 |
| 2008-06 | 15.04 |
| 2008-05 | 16.73 |
| 2008-04 | 13.40 |
| 2008-03 | 15.53 |
| 2008-02 | 18.40 |
| 2008-01 | 7.50 |
| 2007-12 | 4.55 |
| 2007-11 | 8.72 |
| 2007-10 | 6.68 |
| 2007-09 | 12.64 |
| 2007-08 | 10.99 |
| 2007-07 | 11.22 |
| 2007-06 | 9.15 |
| 2007-05 | 7.34 |
| 2007-04 | 8.82 |
| 2007-03 | 8.23 |
| 2007-02 | 2.89 |
| 2007-01 | 20.00 |
| 2006-12 | 9.99 |
| 2006-11 | 7.37 |
| 2006-10 | 10.34 |
| 2006-09 | 9.03 |
| 2006-08 | 7.35 |
| 2006-07 | 8.62 |
| 2006-06 | 10.69 |
| 2006-05 | 10.72 |
| 2006-04 | 16.14 |
| 2006-03 | 14.72 |
| 2006-02 | 18.59 |
| 2006-01 | 3.40 |
| 2005-12 | 10.25 |
| 2005-11 | 11.07 |
| 2005-10 | 10.55 |
| 2005-09 | 11.13 |
| 2005-08 | 11.32 |
| 2005-07 | 11.35 |
| 2005-06 | 12.86 |
| 2005-05 | 12.06 |
| 2005-04 | 6.63 |
| 2005-03 | 6.16 |
| 2005-02 | -0.05 |
| 2005-01 | 22.37 |
| 2004-12 | 8.19 |
| 2004-11 | 12.68 |
| 2004-10 | 14.30 |
| 2004-09 | 17.68 |
| 2004-08 | 16.08 |
| 2004-07 | 12.17 |
| 2004-06 | 11.31 |
| 2004-05 | 13.28 |
| 2004-04 | 15.46 |
| 2004-03 | 12.76 |
| 2004-02 | 19.27 |
| 2004-01 | 3.41 |
| 2003-12 | 12.27 |
| 2003-11 | 15.44 |
| 2003-10 | 15.55 |
| 2003-09 | 10.59 |
| 2003-08 | 10.36 |
| 2003-07 | 16.62 |
| 2003-06 | 16.03 |
| 2003-05 | 13.56 |
| 2003-04 | 11.73 |
| 2003-03 | 12.98 |
| 2003-02 | 12.26 |
| 2003-01 | 9.09 |
| 2002-12 | 14.40 |
| 2002-11 | 8.98 |
| 2002-10 | 11.56 |
| 2002-09 | 15.40 |
| 2002-08 | 13.80 |
| 2002-07 | 14.00 |
| 2002-06 | 12.50 |
| 2002-05 | 13.20 |
| 2002-04 | 11.75 |
| 2002-03 | 11.10 |
| 2002-02 | 4.80 |
| 2002-01 | 23.40 |
| 2001-12 | 8.05 |
| 2001-11 | 10.00 |
| 2001-10 | 10.35 |
| 2001-09 | 8.05 |
| 2001-08 | 7.26 |
| 2001-07 | 4.86 |
| 2001-06 | 6.79 |
| 2001-05 | 6.43 |
| 2001-04 | 9.20 |
| 2001-03 | 9.80 |
| 2001-02 | 26.10 |
| 2001-01 | -2.50 |
| 2000-12 | 1.30 |
| 2000-11 | 0.10 |
| 2000-10 | 4.00 |
| 2000-09 | 2.60 |
| 2000-08 | 2.60 |
| 2000-07 | 2.00 |
| 2000-06 | 6.30 |
| 2000-05 | 2.50 |
| 2000-04 | 1.80 |
| 2000-03 | 5.10 |
| 2000-02 | -7.90 |
| 2000-01 | -0.30 |
| 1999-12 | -14.55 |
| 1999-11 | -10.91 |
| 1999-10 | -10.17 |
| 1999-09 | -7.85 |
| 1999-08 | -3.17 |
| 1999-07 | -1.72 |
| 1999-06 | -10.33 |
| 1999-05 | -10.57 |
| 1999-04 | -7.83 |
| 1999-03 | -9.73 |
| 1999-02 | -1.66 |
| 1999-01 | 12.46 |
| 1998-12 | 5.40 |
| 1998-11 | 3.20 |
| 1998-10 | 1.10 |
| 1998-09 | -1.70 |
| 1998-08 | -6.60 |
| 1998-07 | -6.40 |
| 1998-06 | -0.20 |
| 1998-05 | -1.40 |
| 1998-04 | -4.90 |
| 1998-03 | -3.80 |
| 1998-02 | -11.90 |
| 1998-01 | -12.30 |
| 1997-12 | 0.50 |
| 1997-11 | -0.30 |
| 1997-10 | 0.70 |
| 1997-09 | 1.10 |
| 1997-08 | 3.20 |
| 1997-07 | -1.60 |
| 1997-06 | -3.70 |
| 1997-05 | 1.20 |
| 1997-04 | 1.30 |
| 1997-03 | 5.60 |
| 1997-02 | 2.90 |
| 1997-01 | 2.10 |
| 1996-12 | 0.10 |
| 1996-11 | 5.50 |
| 1996-10 | 6.80 |
| 1996-09 | 7.00 |
| 1996-08 | 7.30 |
| 1996-07 | 6.80 |
| 1996-06 | 7.70 |
| 1996-05 | 8.80 |
| 1996-04 | 7.00 |
| 1996-03 | 5.00 |
| 1996-02 | 3.50 |
| 1996-01 | 13.70 |
| 1995-12 | 6.30 |
| 1995-11 | 3.00 |
| 1995-10 | 6.70 |
| 1995-09 | 2.90 |
| 1995-08 | 0.00 |
| 1995-07 | 6.60 |
| 1995-06 | 7.60 |
| 1995-05 | 2.00 |
| 1995-04 | 6.50 |
| 1995-03 | 10.50 |
| 1995-02 | 20.40 |
| 1995-01 | -1.70 |
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