| 年月 | 单位：% |
| 2008-12 | 13.70 |
| 2008-11 | 15.70 |
| 2008-10 | 10.20 |
| 2008-09 | 13.50 |
| 2008-08 | 14.20 |
| 2008-07 | 13.40 |
| 2008-06 | 13.10 |
| 2008-05 | 11.70 |
| 2008-04 | 12.00 |
| 2008-03 | 11.60 |
| 2008-02 | 10.40 |
| 2008-01 | 10.72 |
| 2007-12 | 5.30 |
| 2007-11 | 5.60 |
| 2007-10 | 6.60 |
| 2007-09 | 6.60 |
| 2007-08 | 6.60 |
| 2007-07 | 7.10 |
| 2007-06 | 9.90 |
| 2007-05 | 10.60 |
| 2007-04 | 13.50 |
| 2007-03 | 17.30 |
| 2007-02 | 17.20 |
| 2007-01 | 35.65 |
| 2006-12 | 13.80 |
| 2006-11 | 13.30 |
| 2006-10 | 11.70 |
| 2006-09 | 12.30 |
| 2006-08 | 12.30 |
| 2006-07 | 12.40 |
| 2006-06 | 10.30 |
| 2006-05 | 8.60 |
| 2006-04 | 5.40 |
| 2006-03 | 2.50 |
| 2006-02 | 1.00 |
| 2005-12 | 2.90 |
| 2005-11 | 2.10 |
| 2005-10 | 2.20 |
| 2005-09 | 2.00 |
| 2005-08 | -0.60 |
| 2005-07 | -1.90 |
| 2005-06 | -1.90 |
| 2005-05 | -2.20 |
| 2005-04 | -3.40 |
| 2005-03 | -1.80 |
| 2005-02 | 12.80 |
| 2005-01 | 29.40 |
| 2004-12 | 7.80 |
| 2004-11 | 7.90 |
| 2004-10 | 7.80 |
| 2004-09 | 9.10 |
| 2004-08 | 10.90 |
| 2004-07 | 10.60 |
| 2004-06 | 10.00 |
| 2004-05 | 8.80 |
| 2004-04 | 8.20 |
| 2004-03 | 9.70 |
| 2004-02 | 11.00 |
| 2004-01 | 5.60 |
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