| 年月 | 单位：% |
| 2008-12 | 10.10 |
| 2008-11 | 12.90 |
| 2008-10 | 15.00 |
| 2008-09 | 17.80 |
| 2008-08 | 22.10 |
| 2008-07 | 27.40 |
| 2008-06 | 32.80 |
| 2008-05 | 36.00 |
| 2008-04 | 40.30 |
| 2008-03 | 44.60 |
| 2008-02 | 46.40 |
| 2008-01 | 58.38 |
| 2007-12 | 55.60 |
| 2007-11 | 58.80 |
| 2007-10 | 49.60 |
| 2007-09 | 46.70 |
| 2007-08 | 41.90 |
| 2007-07 | 38.10 |
| 2007-06 | 31.50 |
| 2007-05 | 24.10 |
| 2007-04 | 16.90 |
| 2007-03 | 10.90 |
| 2007-02 | 24.90 |
| 2007-01 | 21.55 |
| 2006-12 | 8.80 |
| 2006-11 | 9.10 |
| 2006-10 | 12.30 |
| 2006-09 | 13.40 |
| 2006-08 | 16.50 |
| 2006-07 | 23.60 |
| 2006-06 | 34.90 |
| 2006-05 | 45.30 |
| 2006-04 | 51.40 |
| 2006-03 | 61.90 |
| 2006-02 | 44.40 |
| 2005-12 | 39.60 |
| 2005-11 | 25.10 |
| 2005-10 | 25.50 |
| 2005-09 | 25.30 |
| 2005-08 | 21.90 |
| 2005-07 | 14.30 |
| 2005-06 | 4.70 |
| 2005-05 | -5.00 |
| 2005-04 | -8.30 |
| 2005-03 | -14.80 |
| 2005-02 | -5.80 |
| 2005-01 | 14.50 |
| 2004-12 | -11.40 |
| 2004-11 | -8.40 |
| 2004-10 | -7.70 |
| 2004-09 | -5.90 |
| 2004-08 | -4.20 |
| 2004-07 | -1.00 |
| 2004-06 | 10.10 |
| 2004-05 | 15.90 |
| 2004-04 | 19.50 |
| 2004-03 | 16.80 |
| 2004-02 | 24.10 |
| 2004-01 | 4.20 |
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