| 年月 | 单位：部/百人 |
| 2009-05 | 19.10 |
| 2009-04 | 19.10 |
| 2009-03 | 19.10 |
| 2009-02 | 19.10 |
| 2009-01 | 19.10 |
| 2008-12 | 19.10 |
| 2008-11 | 19.90 |
| 2008-10 | 19.90 |
| 2008-09 | 19.90 |
| 2008-08 | 20.20 |
| 2008-07 | 20.20 |
| 2008-06 | 20.20 |
| 2008-05 | 21.10 |
| 2008-04 | 21.10 |
| 2008-03 | 21.10 |
| 2008-02 | 21.10 |
| 2008-01 | 21.10 |
| 2007-12 | 21.10 |
| 2007-11 | 21.60 |
| 2007-10 | 21.60 |
| 2007-09 | 21.60 |
| 2007-08 | 21.80 |
| 2007-07 | 21.80 |
| 2007-06 | 21.80 |
| 2007-05 | 21.60 |
| 2007-04 | 21.60 |
| 2007-03 | 21.60 |
| 2007-02 | 21.60 |
| 2007-01 | 21.60 |
| 2006-12 | 21.60 |
| 2006-11 | 21.80 |
| 2006-10 | 21.80 |
| 2006-09 | 21.80 |
| 2006-08 | 21.70 |
| 2006-07 | 21.70 |
| 2006-06 | 21.70 |
| 2006-05 | 20.90 |
| 2006-04 | 20.90 |
| 2006-03 | 20.90 |
| 2006-02 | 20.90 |
| 2006-01 | 20.90 |
| 2005-12 | 20.90 |
| 2005-11 | 20.80 |
| 2005-10 | 20.80 |
| 2005-09 | 20.80 |
| 2005-08 | 20.40 |
| 2005-07 | 20.40 |
| 2005-06 | 20.40 |
| 2005-05 | 19.00 |
| 2005-04 | 19.00 |
| 2005-03 | 19.00 |
| 2005-02 | 19.00 |
| 2005-01 | 19.00 |
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