| 年月 | 单位：% |
| 2008-12 | -0.40 |
| 2008-11 | 3.00 |
| 2008-10 | 5.70 |
| 2008-09 | 7.20 |
| 2008-08 | 9.00 |
| 2008-07 | 10.10 |
| 2008-06 | 6.00 |
| 2008-05 | -2.50 |
| 2008-04 | 7.20 |
| 2008-03 | 7.30 |
| 2008-02 | 5.10 |
| 2008-01 | 4.21 |
| 2007-12 | 42.20 |
| 2007-11 | 47.10 |
| 2007-10 | 51.70 |
| 2007-09 | 57.30 |
| 2007-08 | 62.90 |
| 2007-07 | 67.30 |
| 2007-06 | 73.60 |
| 2007-05 | 72.70 |
| 2007-04 | 39.40 |
| 2007-03 | 56.50 |
| 2007-02 | 76.90 |
| 2007-01 | 59.16 |
| 2006-12 | 42.50 |
| 2006-11 | 38.50 |
| 2006-10 | 45.70 |
| 2006-09 | 45.30 |
| 2006-08 | 45.60 |
| 2006-07 | 46.80 |
| 2006-06 | 47.20 |
| 2006-05 | 46.20 |
| 2006-04 | 45.50 |
| 2006-03 | 46.80 |
| 2006-02 | 27.70 |
| 2005-12 | 54.70 |
| 2005-11 | 57.70 |
| 2005-10 | 50.50 |
| 2005-09 | 42.30 |
| 2005-08 | 44.60 |
| 2005-07 | 50.40 |
| 2005-06 | 55.80 |
| 2005-05 | 55.70 |
| 2005-04 | 50.50 |
| 2005-03 | 59.20 |
| 2005-02 | 81.00 |
| 2005-01 | 90.00 |
| 2004-12 | 59.10 |
| 2004-11 | 57.50 |
| 2004-10 | 56.20 |
| 2004-09 | 53.80 |
| 2004-08 | 50.70 |
| 2004-07 | 49.70 |
| 2004-06 | 48.90 |
| 2004-05 | 47.70 |
| 2004-04 | 41.90 |
| 2004-03 | 40.70 |
| 2004-02 | 28.60 |
| 2004-01 | 28.20 |
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