| 年月 | 单位：% |
| 2008-12 | -18.00 |
| 2008-11 | -3.80 |
| 2008-10 | -4.60 |
| 2008-09 | -6.80 |
| 2008-08 | -13.00 |
| 2008-07 | -2.00 |
| 2008-06 | 19.30 |
| 2008-05 | 21.80 |
| 2008-04 | 29.80 |
| 2008-03 | 49.40 |
| 2008-02 | 30.70 |
| 2008-01 | 58.38 |
| 2007-12 | 38.10 |
| 2007-11 | 82.30 |
| 2007-10 | 77.60 |
| 2007-09 | 79.70 |
| 2007-08 | 67.20 |
| 2007-07 | 90.50 |
| 2007-06 | 70.20 |
| 2007-05 | 54.70 |
| 2007-04 | 35.10 |
| 2007-03 | -8.20 |
| 2007-02 | 33.90 |
| 2007-01 | 21.55 |
| 2006-12 | 4.60 |
| 2006-11 | -9.80 |
| 2006-10 | 3.40 |
| 2006-09 | -4.50 |
| 2006-08 | -14.60 |
| 2006-07 | -25.40 |
| 2006-06 | -2.80 |
| 2006-05 | 24.50 |
| 2006-04 | 27.80 |
| 2006-03 | 88.20 |
| 2006-02 | 46.00 |
| 2005-12 | 74.40 |
| 2005-11 | 22.40 |
| 2005-10 | 29.60 |
| 2005-09 | 51.00 |
| 2005-08 | 92.50 |
| 2005-07 | 108.30 |
| 2005-06 | 62.50 |
| 2005-05 | 9.60 |
| 2005-04 | 6.00 |
| 2005-03 | -15.20 |
| 2005-02 | -27.30 |
| 2005-01 | 14.50 |
| 2004-12 | -38.80 |
| 2004-11 | -14.00 |
| 2004-10 | -30.80 |
| 2004-09 | -21.80 |
| 2004-08 | -22.40 |
| 2004-07 | -41.40 |
| 2004-06 | -19.00 |
| 2004-05 | 0.00 |
| 2004-04 | 32.30 |
| 2004-03 | -10.40 |
| 2004-02 | 28.30 |
| 2004-01 | 4.20 |
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