| 年月 | 单位：万吨 |
| 2008-12 | 29.03 |
| 2008-11 | 28.11 |
| 2008-10 | 27.06 |
| 2008-09 | 24.02 |
| 2008-08 | 21.78 |
| 2008-07 | 19.54 |
| 2008-06 | 16.65 |
| 2008-05 | 13.73 |
| 2008-04 | 11.14 |
| 2008-03 | 8.55 |
| 2008-02 | 5.29 |
| 2008-01 | 2.75 |
| 2007-12 | 29.91 |
| 2007-11 | 27.56 |
| 2007-10 | 25.24 |
| 2007-09 | 22.86 |
| 2007-08 | 20.30 |
| 2007-07 | 18.39 |
| 2007-06 | 15.77 |
| 2007-05 | 12.84 |
| 2007-04 | 9.91 |
| 2007-03 | 7.95 |
| 2007-02 | 5.02 |
| 2007-01 | 2.66 |
| 2006-12 | 29.05 |
| 2006-11 | 26.85 |
| 2006-10 | 24.16 |
| 2006-09 | 21.53 |
| 2006-08 | 19.37 |
| 2006-07 | 17.11 |
| 2006-06 | 14.82 |
| 2006-05 | 12.07 |
| 2006-04 | 9.37 |
| 2006-03 | 7.08 |
| 2006-02 | 4.97 |
| 2006-01 | 2.45 |
| 2005-12 | 21.38 |
| 2005-11 | 19.00 |
| 2005-10 | 17.09 |
| 2005-09 | 14.98 |
| 2005-08 | 13.25 |
| 2005-07 | 11.72 |
| 2005-06 | 10.15 |
| 2005-05 | 8.93 |
| 2005-04 | 7.38 |
| 2005-03 | 5.48 |
| 2005-02 | 3.59 |
| 2005-01 | 1.70 |
| 2004-12 | 22.77 |
| 2004-11 | 20.53 |
| 2004-10 | 18.63 |
| 2004-09 | 17.02 |
| 2004-08 | 15.17 |
| 2004-07 | 13.27 |
| 2004-06 | 11.24 |
| 2004-05 | 9.36 |
| 2004-04 | 7.48 |
| 2004-03 | 5.49 |
| 2004-02 | 3.59 |
| 2004-01 | 1.75 |
| 2003-12 | 20.08 |
| 2003-11 | 18.36 |
| 2003-10 | 16.66 |
| 2003-09 | 14.79 |
| 2003-08 | 12.96 |
| 2003-07 | 11.22 |
| 2003-06 | 9.87 |
| 2003-05 | 8.40 |
| 2003-04 | 6.80 |
| 2003-03 | 4.88 |
| 2003-02 | 3.16 |
| 2003-01 | 1.53 |
| 2002-12 | 17.05 |
| 2002-11 | 15.42 |
| 2002-10 | 13.87 |
| 2002-09 | 12.14 |
| 2002-08 | 10.12 |
| 2002-07 | 8.62 |
| 2002-06 | 7.29 |
| 2002-05 | 6.01 |
| 2002-04 | 4.76 |
| 2002-03 | 3.58 |
| 2002-02 | 2.42 |
| 2002-01 | 1.28 |
| 2001-12 | 15.25 |
| 2001-11 | 14.16 |
| 2001-10 | 12.91 |
| 2001-09 | 10.03 |
| 2001-08 | 8.89 |
| 2001-07 | 7.70 |
| 2001-06 | 6.77 |
| 2001-05 | 5.61 |
| 2001-04 | 4.47 |
| 2001-03 | 3.30 |
| 2001-02 | 2.09 |
| 2001-01 | 0.93 |
| 2000-12 | 12.96 |
| 2000-11 | 11.70 |
| 2000-10 | 10.61 |
| 2000-09 | 9.40 |
| 2000-08 | 8.39 |
| 2000-07 | 7.29 |
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