| 年月 | 单位:% |
| 2009-12 | 10.13 |
| 2009-11 | 10.00 |
| 2009-10 | 11.10 |
| 2009-09 | 11.50 |
| 2009-08 | 13.50 |
| 2009-07 | 15.20 |
| 2009-06 | 15.80 |
| 2009-05 | 15.90 |
| 2009-04 | 13.40 |
| 2009-03 | 11.00 |
| 2009-02 | 9.40 |
| 2009-01 | 12.00 |
| 2008-12 | 12.90 |
| 2008-11 | 11.40 |
| 2008-10 | 9.30 |
| 2008-09 | 6.60 |
| 2008-08 | 3.90 |
| 2008-07 | 1.00 |
| 2008-06 | -1.90 |
| 2008-05 | -0.40 |
| 2008-04 | -1.00 |
| 2008-03 | -5.20 |
| 2008-02 | 0.80 |
| 2008-01 | 4.20 |
| 2007-12 | 19.90 |
| 2007-11 | 22.00 |
| 2007-10 | 23.40 |
| 2007-09 | 25.00 |
| 2007-08 | 28.40 |
| 2007-07 | 30.40 |
| 2007-06 | 33.19 |
| 2007-05 | 30.80 |
| 2007-04 | 27.54 |
| 2007-03 | 29.10 |
| 2007-02 | 28.74 |
| 2007-01 | 18.18 |
| 2006-12 | 9.90 |
| 2006-11 | 10.10 |
| 2006-10 | 10.80 |
| 2006-09 | 11.40 |
| 2006-08 | 10.20 |
| 2006-07 | 10.50 |
| 2006-06 | 12.70 |
| 2006-05 | 15.00 |
| 2006-04 | 16.40 |
| 2006-03 | 18.80 |
| 2006-02 | 12.80 |
| 2006-01 | 15.10 |
| 2005-12 | 17.60 |
| 2005-11 | 20.30 |
| 2005-10 | 19.90 |
| 2005-09 | 20.00 |
| 2005-08 | 20.50 |
| 2005-07 | 23.20 |
| 2005-06 | 24.80 |
| 2005-05 | 25.90 |
| 2005-04 | 28.20 |
| 2005-03 | 25.90 |
| 2005-02 | 27.80 |
| 2005-01 | 22.80 |
| 2004-12 | 3.90 |
| 2004-11 | 4.80 |
| 2004-10 | 2.40 |
| 2004-09 | 2.60 |
| 2004-08 | 5.60 |
| 2004-07 | 3.50 |
| 2004-06 | 6.80 |
| 2004-05 | 8.00 |
| 2004-04 | 8.50 |
| 2004-03 | 4.50 |
| 2004-02 | 4.30 |
| 2004-01 | 13.60 |
| 2003-12 | 17.40 |
| 2003-11 | 15.70 |
| 2003-10 | 16.10 |
| 2003-09 | 16.90 |
| 2003-08 | 12.90 |
| 2003-07 | 13.90 |
| 2003-06 | 11.50 |
| 2003-05 | 16.30 |
| 2003-04 | 13.90 |
| 2003-03 | 14.00 |
| 2003-02 | 17.90 |
| 2003-01 | 15.79 |
| 2002-12 | -0.50 |
| 2002-11 | -2.00 |
| 2002-10 | -1.60 |
| 2002-09 | -3.60 |
| 2002-08 | -5.40 |
| 2002-07 | -8.30 |
| 2002-06 | -9.60 |
| 2002-05 | -12.20 |
| 2002-04 | -10.00 |
| 2002-03 | -12.30 |
| 2002-02 | -11.40 |
| 2002-01 | -9.50 |
| 2001-12 | -11.30 |
| 2001-11 | -11.40 |
| 2001-10 | -8.50 |
| 2001-09 | -1.20 |
| 2001-08 | 0.70 |
| 2001-07 | 3.10 |
| 2001-06 | 102.70 |
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