| 年月 | 单位：万吨 |
| 2008-12 | 106.16 |
| 2008-11 | 90.56 |
| 2008-10 | 110.69 |
| 2008-09 | 124.96 |
| 2008-08 | 135.72 |
| 2008-07 | 138.14 |
| 2008-06 | 126.10 |
| 2008-05 | 129.04 |
| 2008-04 | 125.41 |
| 2008-03 | 127.94 |
| 2008-02 | 102.36 |
| 2008-01 | 113.15 |
| 2007-12 | 140.15 |
| 2007-11 | 122.03 |
| 2007-10 | 130.33 |
| 2007-09 | 131.22 |
| 2007-08 | 144.01 |
| 2007-07 | 133.16 |
| 2007-06 | 146.52 |
| 2007-05 | 203.15 |
| 2007-04 | 123.41 |
| 2007-03 | 122.45 |
| 2007-02 | 122.93 |
| 2007-01 | 98.71 |
| 2006-12 | 117.89 |
| 2006-11 | 107.02 |
| 2006-10 | 102.14 |
| 2006-09 | 95.66 |
| 2006-08 | 94.96 |
| 2006-07 | 90.90 |
| 2006-06 | 91.51 |
| 2006-05 | 89.75 |
| 2006-04 | 85.18 |
| 2006-03 | 100.43 |
| 2006-02 | 62.70 |
| 2005-12 | 63.56 |
| 2005-11 | 97.87 |
| 2005-10 | 61.10 |
| 2005-09 | 55.92 |
| 2005-08 | 56.10 |
| 2005-07 | 54.11 |
| 2005-06 | 63.38 |
| 2005-05 | 55.82 |
| 2005-04 | 43.03 |
| 2005-03 | 45.78 |
| 2005-02 | 40.49 |
| 2005-01 | 46.85 |
| 2004-12 | 39.79 |
| 2004-11 | 36.56 |
| 2004-10 | 35.33 |
| 2004-09 | 37.44 |
| 2004-08 | 35.32 |
| 2004-07 | 31.15 |
| 2004-06 | 31.08 |
| 2004-05 | 33.40 |
| 2004-04 | 29.78 |
| 2004-03 | 29.25 |
| 2004-02 | 21.28 |
| 2004-01 | 23.85 |
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