| 年月 | 单位：万吨 |
| 2009-05 | 102.14 |
| 2009-04 | 95.90 |
| 2009-03 | 105.40 |
| 2009-02 | 70.21 |
| 2009-01 | 64.38 |
| 2008-12 | 101.57 |
| 2008-11 | 93.88 |
| 2008-10 | 101.63 |
| 2008-09 | 108.71 |
| 2008-08 | 113.79 |
| 2008-07 | 117.73 |
| 2008-06 | 106.13 |
| 2008-05 | 110.01 |
| 2008-04 | 99.40 |
| 2008-03 | 96.24 |
| 2008-02 | 77.56 |
| 2008-01 | 91.04 |
| 2007-12 | 88.44 |
| 2007-11 | 79.39 |
| 2007-10 | 93.41 |
| 2007-09 | 102.55 |
| 2007-08 | 98.32 |
| 2007-07 | 91.46 |
| 2007-06 | 102.37 |
| 2007-05 | 88.52 |
| 2007-04 | 86.65 |
| 2007-03 | 75.29 |
| 2007-02 | 72.96 |
| 2007-01 | 78.48 |
| 2006-12 | 72.09 |
| 2006-11 | 64.36 |
| 2006-10 | 70.60 |
| 2006-09 | 84.01 |
| 2006-08 | 78.68 |
| 2006-07 | 74.49 |
| 2006-06 | 80.43 |
| 2006-05 | 70.99 |
| 2006-04 | 66.05 |
| 2006-03 | 72.30 |
| 2006-02 | 61.96 |
| 2006-01 | 60.73 |
| 2005-12 | 52.74 |
| 2005-11 | 46.78 |
| 2005-10 | 50.88 |
| 2005-09 | 61.85 |
| 2005-08 | 56.93 |
| 2005-07 | 58.67 |
| 2005-06 | 61.63 |
| 2005-05 | 55.51 |
| 2005-04 | 54.82 |
| 2005-03 | 53.05 |
| 2005-02 | 38.64 |
| 2005-01 | 38.99 |
| 2004-12 | 37.85 |
| 2004-11 | 29.86 |
| 2004-10 | 41.94 |
| 2004-09 | 45.51 |
| 2004-08 | 47.84 |
| 2004-07 | 42.76 |
| 2004-06 | 50.35 |
| 2004-05 | 41.38 |
| 2004-04 | 41.75 |
| 2004-03 | 41.49 |
| 2004-02 | 36.00 |
| 2004-01 | 25.55 |
| 2003-12 | 20.82 |
| 2003-11 | 21.15 |
| 2003-10 | 24.91 |
| 2003-09 | 30.19 |
| 2003-08 | 29.31 |
| 2003-07 | 33.81 |
| 2003-06 | 32.92 |
| 2003-05 | 26.97 |
| 2003-04 | 25.25 |
| 2003-03 | 23.23 |
| 2003-02 | 17.63 |
| 2003-01 | 13.31 |
| 2002-12 | 13.30 |
| 2002-11 | 14.84 |
| 2002-10 | 18.41 |
| 2002-09 | 20.83 |
| 2002-08 | 21.15 |
| 2002-07 | 21.63 |
| 2002-06 | 22.99 |
| 2002-05 | 20.55 |
| 2002-04 | 15.91 |
| 2002-03 | 13.31 |
| 2002-02 | 11.23 |
| 2002-01 | 10.07 |
| 2001-12 | 10.84 |
| 2001-11 | 11.33 |
| 2001-10 | 12.04 |
| 2001-09 | 15.13 |
| 2001-08 | 15.64 |
| 2001-07 | 14.10 |
| 2001-06 | 13.44 |
| 2001-05 | 11.25 |
| 2001-04 | 10.16 |
| 2001-03 | 9.66 |
| 2001-02 | 7.88 |
| 2001-01 | 6.52 |
| 2000-12 | 7.83 |
| 2000-11 | 7.41 |
| 2000-10 | 7.46 |
| 2000-09 | 8.48 |
| 2000-08 | 8.63 |
| 2000-07 | 7.81 |
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