| 年月 | 单位：% |
| 2009-05 | -10.70 |
| 2009-04 | -21.90 |
| 2009-03 | -15.80 |
| 2009-02 | -68.30 |
| 2009-01 | -67.42 |
| 2008-12 | 7.90 |
| 2008-11 | 20.90 |
| 2008-10 | 20.40 |
| 2008-09 | 26.20 |
| 2008-08 | 33.00 |
| 2008-07 | 37.50 |
| 2008-06 | 27.40 |
| 2008-05 | 16.90 |
| 2008-04 | 17.00 |
| 2008-03 | 34.60 |
| 2008-02 | -1.20 |
| 2008-01 | -10.73 |
| 2007-12 | 17.60 |
| 2007-11 | 12.50 |
| 2007-10 | 10.30 |
| 2007-09 | 10.40 |
| 2007-08 | 12.10 |
| 2007-07 | 18.80 |
| 2007-06 | 17.70 |
| 2007-05 | 16.30 |
| 2007-04 | 22.00 |
| 2007-03 | 29.10 |
| 2007-02 | 27.70 |
| 2007-01 | 50.05 |
| 2006-12 | 21.30 |
| 2006-11 | 26.30 |
| 2006-10 | 31.50 |
| 2006-09 | 30.90 |
| 2006-08 | 33.30 |
| 2006-07 | 38.00 |
| 2006-06 | 38.80 |
| 2006-05 | 33.60 |
| 2006-04 | 30.60 |
| 2006-03 | 15.40 |
| 2006-02 | 6.70 |
| 2005-12 | -15.30 |
| 2005-11 | -21.20 |
| 2005-10 | -23.20 |
| 2005-09 | -20.30 |
| 2005-08 | -22.40 |
| 2005-07 | -21.40 |
| 2005-06 | -24.00 |
| 2005-05 | -20.30 |
| 2005-04 | -20.00 |
| 2005-03 | -8.50 |
| 2005-02 | 8.00 |
| 2005-01 | 34.60 |
| 2004-12 | 0.70 |
| 2004-11 | -0.20 |
| 2004-10 | 0.20 |
| 2004-09 | 3.40 |
| 2004-08 | 8.00 |
| 2004-07 | 5.30 |
| 2004-06 | 2.50 |
| 2004-05 | 16.60 |
| 2004-04 | 6.80 |
| 2004-03 | 3.60 |
| 2004-02 | 3.00 |
| 2004-01 | -31.30 |
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