| 年月 | 单位：万吨 |
| 2010-12 | 5.80 |
| 2010-11 | 5.50 |
| 2010-10 | 5.26 |
| 2010-09 | 5.20 |
| 2010-08 | 4.70 |
| 2010-07 | 4.80 |
| 2010-06 | 5.60 |
| 2010-05 | 4.93 |
| 2010-04 | 4.80 |
| 2010-03 | 4.40 |
| 2010-02 | 3.53 |
| 2010-01 | 4.51 |
| 2009-12 | 4.82 |
| 2009-11 | 4.87 |
| 2009-10 | 4.44 |
| 2009-09 | 4.63 |
| 2009-08 | 4.56 |
| 2009-07 | 4.59 |
| 2009-06 | 4.94 |
| 2009-05 | 4.17 |
| 2009-04 | 4.96 |
| 2009-03 | 3.77 |
| 2009-02 | 3.30 |
| 2009-01 | 2.86 |
| 2008-12 | 3.90 |
| 2008-11 | 8.78 |
| 2008-10 | 3.41 |
| 2008-09 | 3.62 |
| 2008-08 | 3.70 |
| 2008-07 | 3.99 |
| 2008-06 | 4.02 |
| 2008-05 | 4.10 |
| 2008-04 | 3.76 |
| 2008-03 | 3.68 |
| 2008-02 | 2.57 |
| 2008-01 | 3.35 |
| 2007-12 | 3.88 |
| 2007-11 | 3.69 |
| 2007-10 | 3.52 |
| 2007-09 | 3.65 |
| 2007-08 | 3.51 |
| 2007-07 | 3.56 |
| 2007-06 | 3.36 |
| 2007-05 | 2.92 |
| 2007-04 | 3.25 |
| 2007-03 | 2.82 |
| 2007-02 | 2.25 |
| 2007-01 | 2.99 |
| 2006-12 | 3.56 |
| 2006-11 | 3.16 |
| 2006-10 | 3.09 |
| 2006-09 | 3.59 |
| 2006-08 | 2.99 |
| 2006-07 | 2.74 |
| 2006-06 | 2.89 |
| 2006-05 | 2.72 |
| 2006-04 | 2.79 |
| 2006-03 | 2.67 |
| 2006-02 | 2.27 |
| 2006-01 | 2.58 |
| 2005-12 | 2.95 |
| 2005-11 | 2.74 |
| 2005-10 | 2.55 |
| 2005-09 | 2.88 |
| 2005-08 | 2.34 |
| 2005-07 | 2.20 |
| 2005-06 | 2.12 |
| 2005-05 | 1.92 |
| 2005-04 | 2.01 |
| 2005-03 | 2.48 |
| 2005-02 | 2.04 |
| 2005-01 | 2.05 |
| 2004-12 | 2.06 |
| 2004-11 | 1.96 |
| 2004-10 | 1.85 |
| 2004-09 | 2.22 |
| 2004-08 | 2.16 |
| 2004-07 | 1.95 |
| 2004-06 | 2.03 |
| 2004-05 | 1.74 |
| 2004-04 | 1.79 |
| 2004-03 | 1.90 |
| 2004-02 | 2.10 |
| 2004-01 | 1.80 |
| 2003-12 | 1.98 |
| 2003-11 | 1.97 |
| 2003-10 | 1.74 |
| 2003-09 | 1.89 |
| 2003-08 | 1.59 |
| 2003-07 | 1.58 |
| 2003-06 | 1.74 |
| 2003-05 | 1.70 |
| 2003-04 | 1.62 |
| 2003-03 | 3.03 |
| 2003-02 | 1.32 |
| 2003-01 | 1.32 |
| 2002-12 | 1.50 |
| 2002-11 | 1.51 |
| 2002-10 | 1.45 |
| 2002-09 | 1.61 |
| 2002-08 | 1.43 |
| 2002-07 | 1.37 |
| 2002-06 | 1.44 |
| 2002-05 | 1.36 |
| 2002-04 | 1.43 |
| 2002-03 | 1.25 |
| 2002-02 | 1.06 |
| 2002-01 | 1.11 |
| 2001-12 | 1.14 |
| 2001-11 | 1.25 |
| 2001-10 | 1.18 |
| 2001-09 | 1.29 |
| 2001-08 | 1.18 |
| 2001-07 | 1.11 |
| 2001-06 | 1.12 |
| 2001-05 | 1.08 |
| 2001-04 | 1.13 |
| 2001-03 | 1.17 |
| 2001-02 | 1.12 |
| 2001-01 | 0.89 |
| 2000-12 | 1.20 |
| 2000-11 | 1.23 |
| 2000-10 | 1.19 |
| 2000-09 | 1.28 |
| 2000-08 | 1.22 |
| 2000-07 | 1.07 |
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