| 年月 | 单位：% |
| 2009-05 | -37.50 |
| 2009-04 | -40.60 |
| 2009-03 | -42.50 |
| 2009-02 | -43.10 |
| 2009-01 | -33.33 |
| 2008-12 | -12.30 |
| 2008-11 | -13.70 |
| 2008-10 | -10.30 |
| 2008-09 | -8.50 |
| 2008-08 | -4.40 |
| 2008-07 | 3.50 |
| 2008-06 | 7.40 |
| 2008-05 | 11.70 |
| 2008-04 | 7.90 |
| 2008-03 | 1.50 |
| 2008-02 | -1.10 |
| 2008-01 | -6.06 |
| 2007-12 | 16.20 |
| 2007-11 | 13.60 |
| 2007-10 | 16.50 |
| 2007-09 | 18.30 |
| 2007-08 | 23.50 |
| 2007-07 | 19.90 |
| 2007-06 | 23.30 |
| 2007-05 | 23.90 |
| 2007-04 | 25.50 |
| 2007-03 | 24.10 |
| 2007-02 | 55.10 |
| 2007-01 | 72.00 |
| 2006-12 | 11.30 |
| 2006-11 | 8.70 |
| 2006-10 | 10.60 |
| 2006-09 | 10.50 |
| 2006-08 | 7.70 |
| 2006-07 | 5.80 |
| 2006-06 | 2.10 |
| 2006-05 | 1.60 |
| 2006-04 | 2.40 |
| 2006-03 | 0.00 |
| 2006-02 | -10.00 |
| 2005-12 | 13.70 |
| 2005-11 | 10.90 |
| 2005-10 | 12.10 |
| 2005-09 | 11.50 |
| 2005-08 | 8.80 |
| 2005-07 | 5.00 |
| 2005-06 | 10.50 |
| 2005-05 | 7.30 |
| 2005-04 | 12.80 |
| 2005-03 | 14.70 |
| 2005-02 | 29.30 |
| 2005-01 | 80.00 |
| 2004-12 | 9.20 |
| 2004-11 | 14.70 |
| 2004-10 | 15.20 |
| 2004-09 | 19.50 |
| 2004-08 | 22.50 |
| 2004-07 | 25.40 |
| 2004-06 | 22.10 |
| 2004-05 | 8.10 |
| 2004-04 | -3.80 |
| 2004-03 | -13.70 |
| 2004-02 | -31.10 |
| 2004-01 | -52.90 |
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