| 年月 | 单位：% |
| 2008-12 | -22.20 |
| 2008-11 | -25.30 |
| 2008-10 | -7.30 |
| 2008-09 | 1.50 |
| 2008-08 | 9.20 |
| 2008-07 | 18.90 |
| 2008-06 | 3.50 |
| 2008-05 | -4.40 |
| 2008-04 | 7.10 |
| 2008-03 | 9.70 |
| 2008-02 | 6.10 |
| 2008-01 | 4.21 |
| 2007-12 | 39.00 |
| 2007-11 | 1.80 |
| 2007-10 | 13.30 |
| 2007-09 | 14.80 |
| 2007-08 | 40.90 |
| 2007-07 | 27.60 |
| 2007-06 | 51.80 |
| 2007-05 | 135.60 |
| 2007-04 | 5.30 |
| 2007-03 | 14.40 |
| 2007-02 | 94.30 |
| 2007-01 | 59.16 |
| 2006-12 | 69.10 |
| 2006-11 | 2.30 |
| 2006-10 | 49.70 |
| 2006-09 | 42.80 |
| 2006-08 | 38.30 |
| 2006-07 | 43.50 |
| 2006-06 | 55.10 |
| 2006-05 | 48.40 |
| 2006-04 | 41.90 |
| 2006-03 | 73.60 |
| 2006-02 | 38.70 |
| 2005-12 | 22.90 |
| 2005-11 | 115.30 |
| 2005-10 | 38.20 |
| 2005-09 | 27.60 |
| 2005-08 | 24.00 |
| 2005-07 | 26.90 |
| 2005-06 | 57.20 |
| 2005-05 | 63.60 |
| 2005-04 | 31.10 |
| 2005-03 | 32.60 |
| 2005-02 | 71.60 |
| 2005-01 | 90.00 |
| 2004-12 | 65.20 |
| 2004-11 | 69.80 |
| 2004-10 | 76.40 |
| 2004-09 | 76.90 |
| 2004-08 | 57.00 |
| 2004-07 | 52.80 |
| 2004-06 | 54.40 |
| 2004-05 | 69.10 |
| 2004-04 | 45.10 |
| 2004-03 | 65.10 |
| 2004-02 | 28.90 |
| 2004-01 | 28.20 |
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