| 季度 | 单位：万吨 |
| 2010-12 | 156.60 |
| 2010-09 | 118.30 |
| 2010-06 | 76.50 |
| 2010-03 | 33.80 |
| 2009-12 | 140.30 |
| 2009-09 | 102.90 |
| 2009-06 | 67.40 |
| 2009-03 | 31.20 |
| 2008-12 | 122.00 |
| 2008-09 | 92.80 |
| 2008-06 | 70.00 |
| 2008-03 | 30.80 |
| 2007-12 | 140.30 |
| 2007-09 | 101.70 |
| 2007-06 | 64.80 |
| 2007-03 | 28.00 |
| 2006-12 | 126.20 |
| 2006-09 | 93.70 |
| 2006-06 | 55.60 |
| 2006-03 | 25.90 |
| 2005-12 | 102.80 |
| 2005-09 | 73.00 |
| 2005-06 | 46.70 |
| 2005-03 | 21.60 |
| 2004-12 | 83.70 |
| 2004-09 | 61.00 |
| 2004-06 | 40.20 |
| 2004-03 | 17.00 |
| 2003-12 | 82.30 |
| 2003-09 | 57.00 |
| 2003-06 | 35.20 |
| 2003-03 | 16.50 |
| 2002-12 | 71.30 |
| 2002-09 | 49.00 |
| 2002-06 | 30.10 |
| 2002-03 | 13.90 |
| 2001-12 | 55.30 |
| 2001-09 | 37.30 |
| 2001-06 | 24.30 |
| 2001-03 | 11.60 |
| 2000-12 | 50.20 |
| 2000-09 | 34.80 |
| 2000-06 | 21.90 |
| 2000-03 | 9.90 |
| 1999-12 | 44.10 |
| 1999-09 | 29.20 |
| 1999-06 | 19.00 |
| 1999-03 | 9.30 |
| 1998-12 | 39.03 |
| 1998-09 | 23.25 |
| 1998-06 | 15.20 |
| 1998-03 | 7.18 |
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