| 年月 | 单位：万吨 |
| 2010-12 | 22.60 |
| 2010-11 | 21.30 |
| 2010-10 | 20.06 |
| 2010-09 | 18.10 |
| 2010-08 | 16.90 |
| 2010-07 | 17.60 |
| 2010-06 | 24.70 |
| 2010-05 | 18.04 |
| 2010-04 | 18.00 |
| 2010-03 | 16.70 |
| 2010-02 | 14.10 |
| 2010-01 | 14.19 |
| 2009-12 | 19.46 |
| 2009-11 | 16.59 |
| 2009-10 | 15.46 |
| 2009-09 | 17.68 |
| 2009-08 | 15.53 |
| 2009-07 | 15.24 |
| 2009-06 | 18.17 |
| 2009-05 | 16.59 |
| 2009-04 | 14.17 |
| 2009-03 | 14.94 |
| 2009-02 | 10.13 |
| 2009-01 | 9.10 |
| 2008-12 | 13.22 |
| 2008-11 | 11.99 |
| 2008-10 | 10.22 |
| 2008-09 | 12.82 |
| 2008-08 | 12.47 |
| 2008-07 | 13.56 |
| 2008-06 | 16.58 |
| 2008-05 | 14.26 |
| 2008-04 | 15.26 |
| 2008-03 | 15.56 |
| 2008-02 | 11.22 |
| 2008-01 | 12.08 |
| 2007-12 | 15.85 |
| 2007-11 | 14.27 |
| 2007-10 | 16.42 |
| 2007-09 | 17.05 |
| 2007-08 | 14.22 |
| 2007-07 | 14.55 |
| 2007-06 | 17.32 |
| 2007-05 | 16.19 |
| 2007-04 | 16.01 |
| 2007-03 | 13.27 |
| 2007-02 | 11.51 |
| 2007-01 | 13.09 |
| 2006-12 | 13.10 |
| 2006-11 | 13.34 |
| 2006-10 | 13.13 |
| 2006-09 | 12.45 |
| 2006-08 | 12.13 |
| 2006-07 | 11.63 |
| 2006-06 | 14.04 |
| 2006-05 | 12.69 |
| 2006-04 | 12.48 |
| 2006-03 | 11.88 |
| 2006-02 | 9.32 |
| 2006-01 | 9.13 |
| 2005-12 | 11.35 |
| 2005-11 | 12.82 |
| 2005-10 | 11.84 |
| 2005-09 | 12.10 |
| 2005-08 | 11.59 |
| 2005-07 | 11.22 |
| 2005-06 | 12.29 |
| 2005-05 | 12.00 |
| 2005-04 | 12.02 |
| 2005-03 | 11.34 |
| 2005-02 | 8.86 |
| 2005-01 | 11.10 |
| 2004-12 | 13.02 |
| 2004-11 | 11.83 |
| 2004-10 | 11.37 |
| 2004-09 | 11.85 |
| 2004-08 | 11.28 |
| 2004-07 | 11.36 |
| 2004-06 | 10.96 |
| 2004-05 | 10.77 |
| 2004-04 | 10.75 |
| 2004-03 | 10.94 |
| 2004-02 | 9.48 |
| 2004-01 | 7.75 |
| 2003-12 | 9.69 |
| 2003-11 | 9.84 |
| 2003-10 | 9.10 |
| 2003-09 | 9.59 |
| 2003-08 | 9.50 |
| 2003-07 | 9.41 |
| 2003-06 | 10.33 |
| 2003-05 | 9.90 |
| 2003-04 | 9.58 |
| 2003-03 | 8.89 |
| 2003-02 | 7.81 |
| 2003-01 | 7.76 |
| 2002-12 | 9.08 |
| 2002-11 | 8.90 |
| 2002-10 | 9.27 |
| 2002-09 | 8.87 |
| 2002-08 | 8.45 |
| 2002-07 | 8.28 |
| 2002-06 | 9.51 |
| 2002-05 | 9.13 |
| 2002-04 | 8.61 |
| 2002-03 | 8.23 |
| 2002-02 | 6.69 |
| 2002-01 | 7.92 |
| 2001-12 | 7.92 |
| 2001-11 | 7.78 |
| 2001-10 | 7.65 |
| 2001-09 | 7.98 |
| 2001-08 | 8.02 |
| 2001-07 | 7.40 |
| 2001-06 | 8.54 |
| 2001-05 | 8.29 |
| 2001-04 | 8.29 |
| 2001-03 | 8.12 |
| 2001-02 | 7.37 |
| 2001-01 | 6.00 |
| 2000-12 | 7.92 |
| 2000-11 | 7.57 |
| 2000-10 | 8.03 |
| 2000-09 | 7.86 |
| 2000-08 | 7.47 |
| 2000-07 | 7.49 |
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