| 季度 | 单位：千吨 |
| 2009-09 | 2.00 |
| 2009-06 | 10.00 |
| 2009-03 | 10.00 |
| 2008-12 | 10.00 |
| 2008-09 | 10.00 |
| 2008-06 | 10.00 |
| 2008-03 | 13.00 |
| 2007-12 | 14.00 |
| 2007-09 | 16.00 |
| 2007-06 | 17.00 |
| 2007-03 | 13.00 |
| 2006-12 | 21.00 |
| 2006-09 | 19.00 |
| 2006-06 | 37.00 |
| 2006-03 | 58.00 |
| 2005-12 | 62.00 |
| 2005-09 | 52.00 |
| 2005-06 | 30.00 |
| 2005-03 | 33.00 |
| 2004-12 | 28.00 |
| 2004-09 | 31.00 |
| 2004-06 | 58.00 |
| 2004-03 | 83.00 |
| 2003-12 | 142.00 |
| 2003-09 | 132.00 |
| 2003-06 | 154.00 |
| 2003-03 | 139.00 |
| 2002-12 | 136.00 |
| 2002-09 | 86.00 |
| 2002-06 | 76.00 |
| 2002-03 | 100.00 |
| 2001-12 | 69.00 |
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