| 年月 | 单位：% |
| 2009-05 | 35.50 |
| 2009-04 | 31.80 |
| 2009-03 | 27.20 |
| 2009-02 | 24.00 |
| 2009-01 | -67.42 |
| 2008-12 | -12.60 |
| 2008-11 | -11.80 |
| 2008-10 | -9.60 |
| 2008-09 | -7.00 |
| 2008-08 | -6.00 |
| 2008-07 | -4.70 |
| 2008-06 | -4.30 |
| 2008-05 | -0.80 |
| 2008-04 | -1.60 |
| 2008-03 | -0.50 |
| 2008-02 | -4.50 |
| 2008-01 | -9.86 |
| 2007-12 | 2.40 |
| 2007-11 | 4.30 |
| 2007-10 | 4.30 |
| 2007-09 | 4.10 |
| 2007-08 | 4.20 |
| 2007-07 | 2.10 |
| 2007-06 | -2.00 |
| 2007-05 | -4.20 |
| 2007-04 | -4.10 |
| 2007-03 | -7.00 |
| 2007-02 | 8.60 |
| 2007-01 | 24.96 |
| 2006-12 | 11.20 |
| 2006-11 | 13.00 |
| 2006-10 | 13.50 |
| 2006-09 | 12.50 |
| 2006-08 | 11.80 |
| 2006-07 | 14.40 |
| 2006-06 | 17.60 |
| 2006-05 | 18.70 |
| 2006-04 | 17.70 |
| 2006-03 | 21.20 |
| 2006-02 | 15.40 |
| 2005-12 | -3.10 |
| 2005-11 | -7.30 |
| 2005-10 | -7.90 |
| 2005-09 | -8.60 |
| 2005-08 | -9.70 |
| 2005-07 | -9.90 |
| 2005-06 | -11.50 |
| 2005-05 | -13.70 |
| 2005-04 | -12.90 |
| 2005-03 | -11.20 |
| 2005-02 | -9.60 |
| 2005-01 | 11.80 |
| 2004-12 | 1.70 |
| 2004-11 | 2.00 |
| 2004-10 | 2.90 |
| 2004-09 | 4.70 |
| 2004-08 | 9.40 |
| 2004-07 | 14.70 |
| 2004-06 | 16.60 |
| 2004-05 | 14.00 |
| 2004-04 | 9.10 |
| 2004-03 | 1.40 |
| 2004-02 | -2.70 |
| 2004-01 | -33.70 |
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