| 年月 | 单位：% |
| 2009-12 | 16.97 |
| 2009-11 | 10.24 |
| 2009-10 | 8.08 |
| 2009-09 | 9.00 |
| 2009-08 | 4.70 |
| 2009-07 | 2.00 |
| 2009-06 | 10.80 |
| 2009-05 | 9.90 |
| 2009-04 | 15.80 |
| 2009-03 | 12.40 |
| 2009-02 | 13.90 |
| 2009-01 | 8.70 |
| 2008-12 | -18.70 |
| 2008-11 | -12.70 |
| 2008-10 | -10.60 |
| 2008-09 | -5.90 |
| 2008-08 | 2.80 |
| 2008-07 | 9.50 |
| 2008-06 | 1.50 |
| 2008-05 | 8.70 |
| 2008-04 | -15.60 |
| 2008-03 | -17.40 |
| 2008-02 | -13.80 |
| 2008-01 | -9.80 |
| 2007-12 | 34.40 |
| 2007-11 | 24.30 |
| 2007-10 | 27.10 |
| 2007-09 | 24.90 |
| 2007-08 | 18.50 |
| 2007-07 | 30.10 |
| 2007-06 | 37.00 |
| 2007-05 | 28.60 |
| 2007-04 | 19.39 |
| 2007-03 | 20.00 |
| 2007-02 | 24.21 |
| 2007-01 | 20.19 |
| 2006-12 | 11.60 |
| 2006-11 | 10.00 |
| 2006-10 | 21.50 |
| 2006-09 | 21.70 |
| 2006-08 | 17.70 |
| 2006-07 | 10.00 |
| 2006-06 | 7.10 |
| 2006-05 | 9.40 |
| 2006-04 | 19.40 |
| 2006-03 | 19.70 |
| 2006-02 | 10.00 |
| 2006-01 | 13.80 |
| 2005-12 | 12.00 |
| 2005-11 | 20.80 |
| 2005-10 | 12.10 |
| 2005-09 | 18.20 |
| 2005-08 | 12.00 |
| 2005-07 | 16.10 |
| 2005-06 | 28.80 |
| 2005-05 | 7.40 |
| 2005-04 | 5.90 |
| 2005-03 | -0.10 |
| 2005-02 | 12.70 |
| 2005-01 | 27.50 |
| 2004-12 | 21.20 |
| 2004-11 | 12.30 |
| 2004-10 | 29.00 |
| 2004-09 | 22.80 |
| 2004-08 | 21.10 |
| 2004-07 | 15.00 |
| 2004-06 | 15.80 |
| 2004-05 | 24.10 |
| 2004-04 | 25.60 |
| 2004-03 | 28.60 |
| 2004-02 | 6.70 |
| 2004-01 | -19.70 |
| 2003-12 | 8.20 |
| 2003-11 | 20.40 |
| 2003-10 | 15.10 |
| 2003-09 | 9.60 |
| 2003-08 | 14.00 |
| 2003-07 | 25.00 |
| 2003-06 | 3.70 |
| 2003-05 | 12.50 |
| 2003-04 | -5.60 |
| 2003-03 | -14.30 |
| 2003-02 | 5.30 |
| 2003-01 | 18.18 |
| 2002-12 | -15.30 |
| 2002-11 | -5.30 |
| 2002-10 | -7.00 |
| 2002-09 | -3.70 |
| 2002-08 | -5.70 |
| 2002-07 | -14.30 |
| 2002-06 | -1.80 |
| 2002-05 | -11.10 |
| 2002-03 | 3.70 |
| 2002-02 | -5.00 |
| 2002-01 | -9.70 |
| 2001-12 | 2.90 |
| 2001-11 | -8.10 |
| 2001-10 | -5.00 |
| 2001-09 | -5.30 |
| 2001-08 | 1.90 |
| 2001-07 | 7.70 |
| 2001-06 | 87.30 |
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