| 年月 | 单位：万吨 |
| 2010-12 | 14.10 |
| 2010-11 | 14.40 |
| 2010-10 | 15.07 |
| 2010-09 | 15.70 |
| 2010-08 | 12.00 |
| 2010-07 | 9.30 |
| 2010-06 | 11.40 |
| 2010-05 | 11.67 |
| 2010-04 | 10.40 |
| 2010-03 | 10.20 |
| 2010-02 | 9.55 |
| 2010-01 | 9.75 |
| 2009-12 | 9.61 |
| 2009-11 | 10.07 |
| 2009-10 | 9.45 |
| 2009-09 | 11.61 |
| 2009-08 | 8.16 |
| 2009-07 | 6.62 |
| 2009-06 | 7.43 |
| 2009-05 | 7.20 |
| 2009-04 | 7.07 |
| 2009-03 | 7.03 |
| 2009-02 | 6.69 |
| 2009-01 | 5.61 |
| 2008-12 | 7.62 |
| 2008-11 | 6.26 |
| 2008-10 | 7.61 |
| 2008-09 | 8.47 |
| 2008-08 | 7.14 |
| 2008-07 | 6.45 |
| 2008-06 | 6.63 |
| 2008-05 | 6.84 |
| 2008-04 | 5.49 |
| 2008-03 | 5.58 |
| 2008-02 | 5.47 |
| 2008-01 | 5.24 |
| 2007-12 | 5.23 |
| 2007-11 | 5.42 |
| 2007-10 | 5.65 |
| 2007-09 | 8.27 |
| 2007-08 | 6.13 |
| 2007-07 | 4.15 |
| 2007-06 | 4.46 |
| 2007-05 | 4.62 |
| 2007-04 | 4.70 |
| 2007-03 | 4.70 |
| 2007-02 | 4.88 |
| 2007-01 | 7.70 |
| 2006-12 | 5.38 |
| 2006-11 | 5.34 |
| 2006-10 | 6.00 |
| 2006-09 | 7.05 |
| 2006-08 | 5.13 |
| 2006-07 | 4.28 |
| 2006-06 | 4.23 |
| 2006-05 | 3.90 |
| 2006-04 | 4.14 |
| 2006-03 | 3.92 |
| 2006-02 | 4.53 |
| 2006-01 | 4.62 |
| 2005-12 | 4.36 |
| 2005-11 | 3.71 |
| 2005-10 | 4.15 |
| 2005-09 | 4.59 |
| 2005-08 | 3.29 |
| 2005-07 | 2.86 |
| 2005-06 | 2.98 |
| 2005-05 | 3.02 |
| 2005-04 | 2.77 |
| 2005-03 | 2.53 |
| 2005-02 | 3.09 |
| 2005-01 | 2.64 |
| 2004-12 | 2.96 |
| 2004-11 | 2.97 |
| 2004-10 | 2.95 |
| 2004-09 | 3.85 |
| 2004-08 | 2.48 |
| 2004-07 | 2.11 |
| 2004-06 | 2.26 |
| 2004-05 | 2.21 |
| 2004-04 | 2.41 |
| 2004-03 | 1.97 |
| 2004-02 | 2.23 |
| 2004-01 | 2.54 |
| 2003-12 | 2.16 |
| 2003-11 | 1.92 |
| 2003-10 | 1.78 |
| 2003-09 | 2.54 |
| 2003-08 | 2.21 |
| 2003-07 | 1.31 |
| 2003-06 | 1.31 |
| 2003-05 | 1.31 |
| 2003-04 | 1.63 |
| 2003-03 | 1.71 |
| 2003-02 | 1.74 |
| 2003-01 | 1.99 |
| 2002-12 | 1.85 |
| 2002-11 | 2.02 |
| 2002-10 | 2.08 |
| 2002-09 | 3.26 |
| 2002-08 | 1.70 |
| 2002-07 | 1.29 |
| 2002-06 | 1.55 |
| 2002-05 | 1.20 |
| 2002-04 | 1.31 |
| 2002-03 | 1.20 |
| 2002-02 | 1.48 |
| 2002-01 | 1.26 |
| 2001-12 | 1.31 |
| 2001-11 | 1.20 |
| 2001-10 | 1.26 |
| 2001-09 | 1.93 |
| 2001-08 | 1.03 |
| 2001-07 | 0.91 |
| 2001-06 | 1.15 |
| 2001-05 | 1.00 |
| 2001-04 | 1.03 |
| 2001-03 | 1.42 |
| 2001-02 | 0.96 |
| 2001-01 | 1.00 |
| 2000-12 | 1.37 |
| 2000-11 | 1.17 |
| 2000-10 | 0.85 |
| 2000-09 | 1.55 |
| 2000-08 | 1.26 |
| 2000-07 | 0.65 |
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