| 年月 | 单位：万吨 |
| 2008-12 | 2.86 |
| 2008-11 | 2.61 |
| 2008-10 | 3.50 |
| 2008-09 | 2.42 |
| 2008-08 | 3.06 |
| 2008-07 | 3.48 |
| 2008-06 | 3.75 |
| 2008-05 | 4.05 |
| 2008-04 | 4.09 |
| 2008-03 | 4.11 |
| 2008-02 | 3.81 |
| 2008-01 | 4.20 |
| 2007-12 | 3.97 |
| 2007-11 | 4.14 |
| 2007-10 | 3.90 |
| 2007-09 | 3.86 |
| 2007-08 | 3.12 |
| 2007-07 | 2.80 |
| 2007-06 | 3.93 |
| 2007-05 | 3.69 |
| 2007-04 | 2.75 |
| 2007-03 | 3.93 |
| 2007-02 | 3.68 |
| 2007-01 | 4.07 |
| 2006-12 | 3.94 |
| 2006-11 | 3.66 |
| 2006-10 | 3.28 |
| 2006-09 | 3.52 |
| 2006-08 | 3.54 |
| 2006-07 | 3.82 |
| 2006-06 | 3.92 |
| 2006-05 | 3.61 |
| 2006-04 | 3.12 |
| 2006-03 | 3.30 |
| 2006-02 | 3.55 |
| 2006-01 | 3.66 |
| 2005-12 | 3.54 |
| 2005-11 | 3.95 |
| 2005-10 | 3.93 |
| 2005-09 | 3.84 |
| 2005-08 | 2.96 |
| 2005-07 | 3.16 |
| 2005-06 | 3.14 |
| 2005-05 | 3.18 |
| 2005-04 | 2.34 |
| 2005-03 | 3.11 |
| 2005-02 | 3.07 |
| 2005-01 | 3.40 |
| 2004-12 | 3.32 |
| 2004-11 | 3.60 |
| 2004-10 | 3.54 |
| 2004-09 | 3.05 |
| 2004-08 | 3.22 |
| 2004-07 | 3.44 |
| 2004-06 | 2.69 |
| 2004-05 | 3.53 |
| 2004-04 | 3.30 |
| 2004-03 | 3.05 |
| 2004-02 | 3.41 |
| 2004-01 | 3.60 |
| 2003-12 | 4.18 |
| 2003-11 | 3.79 |
| 2003-10 | 3.67 |
| 2003-09 | 3.46 |
| 2003-08 | 3.32 |
| 2003-07 | 2.35 |
| 2003-06 | 3.11 |
| 2003-05 | 3.35 |
| 2003-04 | 3.18 |
| 2003-03 | 2.59 |
| 2003-02 | 2.92 |
| 2003-01 | 3.13 |
| 2002-12 | 3.16 |
| 2002-11 | 2.93 |
| 2002-10 | 3.08 |
| 2002-09 | 3.05 |
| 2002-08 | 2.17 |
| 2002-07 | 2.71 |
| 2002-06 | 2.86 |
| 2002-05 | 2.43 |
| 2002-04 | 3.16 |
| 2002-03 | 3.30 |
| 2002-02 | 2.70 |
| 2002-01 | 2.58 |
| 2001-12 | 3.05 |
| 2001-11 | 3.05 |
| 2001-10 | 2.84 |
| 2001-09 | 2.07 |
| 2001-08 | 5.00 |
| 2001-07 | 2.90 |
| 2001-06 | 2.76 |
| 2001-05 | 2.67 |
| 2001-04 | 2.89 |
| 2001-03 | 2.94 |
| 2001-02 | 2.08 |
| 2001-01 | 2.16 |
| 2000-12 | 2.49 |
| 2000-11 | 2.42 |
| 2000-10 | 1.57 |
| 2000-09 | 1.56 |
| 2000-08 | 1.42 |
| 2000-07 | 1.79 |
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