| 季度 | 单位：万吨 |
| 2010-12 | 0.50 |
| 2010-09 | 0.40 |
| 2010-06 | 0.30 |
| 2010-03 | 0.10 |
| 2009-12 | 0.80 |
| 2009-09 | 0.40 |
| 2009-06 | 0.20 |
| 2009-03 | 0.10 |
| 2008-12 | 1.20 |
| 2008-09 | 2.10 |
| 2008-06 | 0.40 |
| 2008-03 | 0.20 |
| 2007-12 | 1.30 |
| 2007-09 | 0.90 |
| 2007-06 | 0.20 |
| 2007-03 | 0.00 |
| 2006-12 | 0.80 |
| 2006-09 | 0.60 |
| 2006-06 | 0.30 |
| 2006-03 | 0.10 |
| 2005-12 | 2.00 |
| 2005-09 | 1.90 |
| 2005-06 | 1.30 |
| 2005-03 | 0.20 |
| 2004-12 | 1.30 |
| 2004-09 | 1.20 |
| 2004-06 | 0.80 |
| 2004-03 | 0.40 |
| 2003-12 | 1.80 |
| 2003-09 | 0.40 |
| 2003-06 | 0.30 |
| 2003-03 | 0.20 |
| 2002-12 | 1.20 |
| 2002-09 | 0.90 |
| 2002-06 | 0.20 |
| 2002-03 | 0.20 |
| 2001-12 | 0.20 |
| 2001-09 | 0.20 |
| 2001-06 | 0.10 |
| 2001-03 | 0.10 |
| 2000-12 | 0.30 |
| 2000-09 | 0.20 |
| 2000-06 | 0.10 |
| 1999-12 | 0.60 |
| 1999-09 | 0.40 |
| 1999-06 | 0.40 |
| 1999-03 | 0.10 |
| 1998-12 | 1.02 |
| 1998-09 | 0.39 |
| 1998-06 | 0.24 |
| 1998-03 | 0.10 |
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