| 年月 | 单位：% |
| 2009-11 | 13.40 |
| 2009-10 | 17.80 |
| 2009-09 | 16.30 |
| 2009-08 | 12.40 |
| 2009-07 | 10.10 |
| 2009-06 | 11.60 |
| 2009-05 | 9.80 |
| 2009-04 | 6.20 |
| 2009-03 | 4.60 |
| 2009-02 | -12.20 |
| 2009-01 | 25.90 |
| 2008-12 | 11.70 |
| 2008-11 | 11.50 |
| 2008-10 | 5.10 |
| 2008-09 | 15.60 |
| 2008-08 | 24.00 |
| 2008-07 | 27.60 |
| 2008-06 | 25.10 |
| 2008-05 | 12.50 |
| 2008-04 | 17.10 |
| 2008-03 | 30.40 |
| 2008-02 | 8.60 |
| 2008-01 | 29.80 |
| 2007-12 | 21.10 |
| 2007-11 | 23.10 |
| 2007-10 | 25.70 |
| 2007-09 | 24.30 |
| 2007-08 | 19.10 |
| 2007-07 | 18.10 |
| 2007-06 | 16.00 |
| 2007-05 | 19.00 |
| 2007-04 | 10.60 |
| 2007-03 | 16.10 |
| 2007-02 | 68.34 |
| 2007-01 | -3.20 |
| 2006-12 | 25.80 |
| 2006-11 | 22.50 |
| 2006-10 | 19.60 |
| 2006-09 | 18.20 |
| 2006-08 | 12.50 |
| 2006-07 | 12.11 |
| 2006-06 | 9.75 |
| 2006-05 | 14.66 |
| 2006-04 | 5.85 |
| 2006-03 | 13.22 |
| 2006-02 | 2.81 |
| 2006-01 | 10.10 |
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