| 年月 | 单位：% |
| 2009-05 | -34.40 |
| 2009-04 | -35.50 |
| 2009-03 | -20.70 |
| 2009-02 | -25.00 |
| 2009-01 | -33.33 |
| 2008-12 | -30.90 |
| 2008-11 | -41.70 |
| 2008-10 | -34.00 |
| 2008-09 | -40.00 |
| 2008-08 | -39.70 |
| 2008-07 | -25.00 |
| 2008-06 | 3.40 |
| 2008-05 | 32.00 |
| 2008-04 | 18.20 |
| 2008-03 | 11.90 |
| 2008-02 | 0.00 |
| 2008-01 | -6.06 |
| 2007-12 | 9.60 |
| 2007-11 | 6.20 |
| 2007-10 | 5.90 |
| 2007-09 | -6.80 |
| 2007-08 | 14.50 |
| 2007-07 | 9.40 |
| 2007-06 | 23.50 |
| 2007-05 | 20.50 |
| 2007-04 | 9.30 |
| 2007-03 | -22.60 |
| 2007-02 | 23.50 |
| 2007-01 | 72.00 |
| 2006-12 | -16.20 |
| 2006-11 | 12.20 |
| 2006-10 | 14.60 |
| 2006-09 | 20.30 |
| 2006-08 | 21.70 |
| 2006-07 | 35.10 |
| 2006-06 | 8.70 |
| 2006-05 | 8.10 |
| 2006-04 | 2.60 |
| 2006-03 | 24.20 |
| 2006-02 | 16.70 |
| 2005-12 | 38.30 |
| 2005-11 | 2.10 |
| 2005-10 | 15.20 |
| 2005-09 | 15.90 |
| 2005-08 | 11.40 |
| 2005-07 | -3.20 |
| 2005-06 | 18.20 |
| 2005-05 | 3.30 |
| 2005-04 | 11.90 |
| 2005-03 | -5.90 |
| 2005-02 | -38.10 |
| 2005-01 | 80.00 |
| 2004-12 | -22.60 |
| 2004-11 | 14.60 |
| 2004-10 | -13.90 |
| 2004-09 | -2.20 |
| 2004-08 | 5.00 |
| 2004-07 | 52.00 |
| 2004-06 | 121.10 |
| 2004-05 | 65.00 |
| 2004-04 | 27.80 |
| 2004-03 | 21.20 |
| 2004-02 | 26.30 |
| 2004-01 | -52.90 |
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