| 年月 | 单位：% |
| 2008-12 | -28.00 |
| 2008-11 | -37.00 |
| 2008-10 | -10.30 |
| 2008-09 | -37.10 |
| 2008-08 | -1.90 |
| 2008-07 | 24.30 |
| 2008-06 | -4.60 |
| 2008-05 | 9.80 |
| 2008-04 | 48.70 |
| 2008-03 | 4.60 |
| 2008-02 | 3.50 |
| 2008-01 | 3.09 |
| 2007-12 | 0.80 |
| 2007-11 | 13.10 |
| 2007-10 | 18.90 |
| 2007-09 | 19.10 |
| 2007-08 | -11.90 |
| 2007-07 | -26.50 |
| 2007-06 | 0.30 |
| 2007-05 | 2.20 |
| 2007-04 | -11.90 |
| 2007-03 | 19.50 |
| 2007-02 | 3.40 |
| 2007-01 | 10.94 |
| 2006-12 | 10.70 |
| 2006-11 | -8.30 |
| 2006-10 | -16.80 |
| 2006-09 | -7.90 |
| 2006-08 | 18.40 |
| 2006-07 | 19.40 |
| 2006-06 | 24.10 |
| 2006-05 | 23.20 |
| 2006-04 | 28.07 |
| 2006-03 | 5.10 |
| 2006-02 | 12.00 |
| 2006-01 | 6.84 |
| 2005-12 | 5.19 |
| 2005-11 | 6.43 |
| 2005-10 | 10.47 |
| 2005-09 | 23.19 |
| 2005-08 | -8.47 |
| 2005-07 | -9.97 |
| 2005-06 | 14.09 |
| 2005-05 | -10.26 |
| 2005-04 | -29.27 |
| 2005-03 | 1.90 |
| 2005-02 | -10.16 |
| 2005-01 | -1.20 |
| 2004-12 | -20.43 |
| 2004-11 | -5.75 |
| 2004-10 | -3.76 |
| 2004-09 | -11.73 |
| 2004-08 | -3.03 |
| 2004-07 | 46.60 |
| 2004-06 | -13.79 |
| 2004-05 | 5.30 |
| 2004-04 | 3.72 |
| 2004-03 | 17.34 |
| 2004-02 | 16.69 |
| 2004-01 | 15.40 |
| 2003-12 | 32.02 |
| 2003-11 | 29.46 |
| 2003-10 | 19.24 |
| 2003-09 | 13.43 |
| 2003-08 | 52.92 |
| 2003-07 | -13.37 |
| 2003-06 | 8.93 |
| 2003-05 | 38.05 |
| 2003-04 | 0.61 |
| 2003-03 | -21.47 |
| 2003-02 | 8.26 |
| 2003-01 | 21.32 |
| 2002-12 | 3.88 |
| 2002-11 | -4.16 |
| 2002-10 | 8.66 |
| 2002-09 | 46.91 |
| 2002-08 | -19.85 |
| 2002-07 | -17.01 |
| 2002-06 | -0.14 |
| 2002-05 | -37.78 |
| 2002-04 | 15.08 |
| 2002-03 | 23.28 |
| 2002-02 | 29.37 |
| 2002-01 | 19.44 |
| 2001-12 | 23.98 |
| 2001-11 | 16.86 |
| 2001-10 | -0.96 |
| 2001-09 | 14.87 |
| 2001-08 | 13.35 |
| 2001-07 | 17.51 |
| 2001-06 | 13.85 |
| 2001-05 | -2.46 |
| 2001-04 | 14.00 |
| 2001-03 | 7.50 |
| 2001-02 | -21.40 |
| 2001-01 | -7.20 |
| 2000-12 | -2.10 |
| 2000-11 | -14.60 |
| 2000-10 | -2.80 |
| 2000-09 | 15.50 |
| 2000-08 | 29.10 |
| 2000-07 | 21.00 |
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