| 年月 | 单位：% |
| 2009-11 | 10.40 |
| 2009-10 | 4.70 |
| 2009-09 | 8.20 |
| 2009-08 | 7.80 |
| 2009-07 | 6.00 |
| 2009-06 | 4.30 |
| 2009-05 | 8.30 |
| 2009-04 | 4.30 |
| 2009-03 | 0.90 |
| 2009-02 | -22.20 |
| 2009-01 | 26.80 |
| 2008-12 | 8.70 |
| 2008-11 | 10.20 |
| 2008-10 | 11.80 |
| 2008-09 | 17.80 |
| 2008-08 | 20.20 |
| 2008-07 | 19.70 |
| 2008-06 | 22.80 |
| 2008-05 | 20.20 |
| 2008-04 | 21.80 |
| 2008-03 | 16.80 |
| 2008-02 | 10.50 |
| 2008-01 | 40.70 |
| 2007-12 | 13.20 |
| 2007-11 | 15.50 |
| 2007-10 | 19.90 |
| 2007-09 | 17.90 |
| 2007-08 | 17.70 |
| 2007-07 | 15.60 |
| 2007-06 | 16.20 |
| 2007-05 | 16.80 |
| 2007-04 | 17.40 |
| 2007-03 | 17.50 |
| 2007-02 | 93.40 |
| 2007-01 | -21.80 |
| 2006-12 | 17.40 |
| 2006-11 | 19.50 |
| 2006-10 | 13.00 |
| 2006-09 | 13.00 |
| 2006-08 | 10.50 |
| 2006-07 | 10.04 |
| 2006-06 | 15.24 |
| 2006-05 | 23.54 |
| 2006-04 | 18.92 |
| 2006-03 | 16.51 |
| 2006-02 | 12.58 |
| 2006-01 | 20.57 |
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