| 年月 | 单位：万吨 |
| 2008-12 | 0.92 |
| 2008-11 | 1.04 |
| 2008-10 | 2.10 |
| 2008-09 | 2.24 |
| 2008-08 | 2.23 |
| 2008-07 | 2.89 |
| 2008-06 | 2.93 |
| 2008-05 | 2.60 |
| 2008-04 | 2.59 |
| 2008-03 | 3.25 |
| 2008-02 | 2.54 |
| 2008-01 | 2.75 |
| 2007-12 | 2.67 |
| 2007-11 | 2.31 |
| 2007-10 | 2.38 |
| 2007-09 | 2.56 |
| 2007-08 | 1.93 |
| 2007-07 | 2.62 |
| 2007-06 | 2.93 |
| 2007-05 | 2.93 |
| 2007-04 | 1.96 |
| 2007-03 | 2.93 |
| 2007-02 | 2.36 |
| 2007-01 | 2.66 |
| 2006-12 | 2.21 |
| 2006-11 | 2.68 |
| 2006-10 | 2.63 |
| 2006-09 | 2.16 |
| 2006-08 | 2.26 |
| 2006-07 | 2.28 |
| 2006-06 | 2.75 |
| 2006-05 | 2.70 |
| 2006-04 | 2.30 |
| 2006-03 | 2.12 |
| 2006-02 | 2.52 |
| 2006-01 | 2.45 |
| 2005-12 | 2.15 |
| 2005-11 | 1.90 |
| 2005-10 | 2.11 |
| 2005-09 | 1.72 |
| 2005-08 | 1.53 |
| 2005-07 | 1.57 |
| 2005-06 | 1.21 |
| 2005-05 | 1.55 |
| 2005-04 | 1.90 |
| 2005-03 | 1.91 |
| 2005-02 | 1.88 |
| 2005-01 | 1.70 |
| 2004-12 | 2.24 |
| 2004-11 | 1.90 |
| 2004-10 | 1.61 |
| 2004-09 | 1.84 |
| 2004-08 | 1.90 |
| 2004-07 | 2.02 |
| 2004-06 | 1.88 |
| 2004-05 | 1.88 |
| 2004-04 | 2.00 |
| 2004-03 | 1.89 |
| 2004-02 | 1.83 |
| 2004-01 | 1.75 |
| 2003-12 | 1.73 |
| 2003-11 | 1.69 |
| 2003-10 | 1.87 |
| 2003-09 | 1.82 |
| 2003-08 | 1.76 |
| 2003-07 | 1.34 |
| 2003-06 | 1.47 |
| 2003-05 | 1.60 |
| 2003-04 | 1.92 |
| 2003-03 | 1.72 |
| 2003-02 | 1.62 |
| 2003-01 | 1.53 |
| 2002-12 | 1.64 |
| 2002-11 | 1.55 |
| 2002-10 | 1.73 |
| 2002-09 | 2.02 |
| 2002-08 | 1.50 |
| 2002-07 | 1.34 |
| 2002-06 | 1.28 |
| 2002-05 | 1.25 |
| 2002-04 | 1.18 |
| 2002-03 | 1.17 |
| 2002-02 | 1.14 |
| 2002-01 | 1.28 |
| 2001-12 | 1.09 |
| 2001-11 | 1.26 |
| 2001-10 | 2.87 |
| 2001-09 | 1.14 |
| 2001-08 | 1.19 |
| 2001-07 | 0.93 |
| 2001-06 | 1.16 |
| 2001-05 | 1.14 |
| 2001-04 | 1.17 |
| 2001-03 | 1.21 |
| 2001-02 | 1.16 |
| 2001-01 | 0.93 |
| 2000-12 | 1.26 |
| 2000-11 | 1.08 |
| 2000-10 | 1.22 |
| 2000-09 | 1.01 |
| 2000-08 | 1.10 |
| 2000-07 | 1.07 |
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