| 年月 | 单位：万吨 |
| 2008-12 | 10.92 |
| 2008-11 | 11.23 |
| 2008-10 | 9.64 |
| 2008-09 | 13.14 |
| 2008-08 | 14.41 |
| 2008-07 | 13.51 |
| 2008-06 | 14.34 |
| 2008-05 | 13.64 |
| 2008-04 | 14.23 |
| 2008-03 | 14.19 |
| 2008-02 | 11.24 |
| 2008-01 | 13.42 |
| 2007-12 | 11.89 |
| 2007-11 | 11.59 |
| 2007-10 | 11.74 |
| 2007-09 | 11.82 |
| 2007-08 | 11.59 |
| 2007-07 | 11.00 |
| 2007-06 | 11.91 |
| 2007-05 | 11.71 |
| 2007-04 | 12.09 |
| 2007-03 | 12.28 |
| 2007-02 | 9.80 |
| 2007-01 | 11.29 |
| 2006-12 | 11.31 |
| 2006-11 | 11.84 |
| 2006-10 | 10.82 |
| 2006-09 | 10.92 |
| 2006-08 | 10.99 |
| 2006-07 | 11.75 |
| 2006-06 | 11.04 |
| 2006-05 | 11.56 |
| 2006-04 | 11.51 |
| 2006-03 | 11.16 |
| 2006-02 | 7.94 |
| 2005-12 | 8.86 |
| 2005-11 | 7.87 |
| 2005-10 | 8.97 |
| 2005-09 | 8.26 |
| 2005-08 | 8.53 |
| 2005-07 | 7.94 |
| 2005-06 | 7.89 |
| 2005-05 | 8.18 |
| 2005-04 | 7.99 |
| 2005-03 | 8.31 |
| 2005-02 | 6.75 |
| 2005-01 | 8.72 |
| 2004-12 | 7.43 |
| 2004-11 | 7.28 |
| 2004-10 | 6.35 |
| 2004-09 | 6.87 |
| 2004-08 | 7.68 |
| 2004-07 | 7.42 |
| 2004-06 | 7.15 |
| 2004-05 | 7.26 |
| 2004-04 | 7.57 |
| 2004-03 | 7.90 |
| 2004-02 | 7.11 |
| 2004-01 | 7.03 |
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