| 年月 | 单位：亿元 |
| 2009-12 | 22.72 |
| 2009-11 | 19.07 |
| 2009-10 | 18.55 |
| 2009-09 | 18.70 |
| 2009-08 | 17.60 |
| 2009-07 | 18.00 |
| 2009-06 | 18.20 |
| 2009-05 | 17.90 |
| 2009-04 | 16.10 |
| 2009-03 | 15.70 |
| 2009-02 | 15.00 |
| 2009-01 | 15.00 |
| 2008-12 | 12.50 |
| 2008-11 | 11.90 |
| 2008-10 | 12.50 |
| 2008-09 | 12.90 |
| 2008-08 | 12.70 |
| 2008-07 | 13.80 |
| 2008-06 | 13.90 |
| 2008-05 | 13.70 |
| 2008-04 | 9.90 |
| 2008-03 | 9.90 |
| 2008-02 | 10.20 |
| 2008-01 | 11.20 |
| 2007-12 | 15.40 |
| 2007-11 | 13.70 |
| 2007-10 | 14.00 |
| 2007-09 | 13.70 |
| 2007-08 | 12.40 |
| 2007-07 | 12.60 |
| 2007-06 | 13.70 |
| 2007-05 | 12.60 |
| 2007-04 | 11.70 |
| 2007-03 | 12.00 |
| 2007-02 | 11.80 |
| 2007-01 | 12.50 |
| 2006-12 | 11.40 |
| 2006-11 | 11.00 |
| 2006-10 | 11.00 |
| 2006-09 | 11.00 |
| 2006-08 | 10.40 |
| 2006-07 | 9.70 |
| 2006-06 | 10.00 |
| 2006-05 | 9.80 |
| 2006-04 | 9.80 |
| 2006-03 | 10.00 |
| 2006-02 | 9.50 |
| 2006-01 | 10.40 |
| 2005-12 | 10.30 |
| 2005-11 | 9.60 |
| 2005-10 | 8.90 |
| 2005-09 | 8.90 |
| 2005-08 | 8.50 |
| 2005-07 | 8.60 |
| 2005-06 | 9.10 |
| 2005-05 | 8.50 |
| 2005-04 | 7.70 |
| 2005-03 | 7.40 |
| 2005-02 | 7.50 |
| 2005-01 | 6.90 |
| 2004-12 | 8.00 |
| 2004-11 | 7.30 |
| 2004-10 | 8.00 |
| 2004-09 | 7.00 |
| 2004-08 | 6.90 |
| 2004-07 | 6.90 |
| 2004-06 | 6.60 |
| 2004-05 | 6.70 |
| 2004-04 | 6.50 |
| 2004-03 | 6.30 |
| 2004-02 | 6.40 |
| 2004-01 | 5.30 |
| 2003-12 | 6.60 |
| 2003-11 | 6.50 |
| 2003-10 | 6.10 |
| 2003-09 | 5.70 |
| 2003-08 | 5.70 |
| 2003-07 | 6.00 |
| 2003-06 | 5.60 |
| 2003-05 | 5.40 |
| 2003-04 | 5.10 |
| 2003-03 | 4.80 |
| 2003-02 | 6.00 |
| 2003-01 | 6.50 |
| 2002-12 | 6.10 |
| 2002-11 | 5.40 |
| 2002-10 | 5.30 |
| 2002-09 | 5.20 |
| 2002-08 | 5.00 |
| 2002-07 | 4.80 |
| 2002-06 | 5.40 |
| 2002-05 | 4.80 |
| 2002-04 | 5.40 |
| 2002-03 | 5.60 |
| 2002-02 | 5.70 |
| 2002-01 | 5.60 |
| 2001-12 | 7.20 |
| 2001-11 | 5.70 |
| 2001-10 | 5.70 |
| 2001-09 | 5.40 |
| 2001-08 | 5.30 |
| 2001-07 | 5.60 |
| 2001-06 | 5.50 |
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