| 年月 | 单位：% |
| 2008-12 | 4.90 |
| 2008-11 | 5.70 |
| 2008-10 | 4.80 |
| 2008-09 | 3.30 |
| 2008-08 | 10.80 |
| 2008-07 | 31.80 |
| 2008-06 | 37.20 |
| 2008-05 | 38.30 |
| 2008-04 | 2.50 |
| 2008-03 | 21.00 |
| 2008-02 | -15.00 |
| 2008-01 | 39.50 |
| 2007-12 | 25.00 |
| 2007-11 | 34.30 |
| 2007-10 | 43.10 |
| 2007-09 | 41.00 |
| 2007-08 | 34.00 |
| 2007-07 | 20.00 |
| 2007-06 | 19.44 |
| 2007-05 | 43.30 |
| 2007-04 | 32.43 |
| 2007-03 | 20.59 |
| 2007-02 | 12.20 |
| 2007-01 | 10.53 |
| 2006-12 | 31.40 |
| 2006-11 | 1.30 |
| 2006-10 | -14.40 |
| 2006-09 | -21.00 |
| 2006-08 | -10.00 |
| 2006-07 | 0.80 |
| 2006-06 | -1.50 |
| 2006-05 | -15.20 |
| 2006-04 | -8.80 |
| 2006-03 | 3.70 |
| 2006-02 | 9.20 |
| 2006-01 | 7.80 |
| 2005-12 | 22.80 |
| 2005-11 | 27.60 |
| 2005-10 | 15.30 |
| 2005-09 | 73.20 |
| 2005-08 | 26.40 |
| 2005-07 | 31.00 |
| 2005-06 | 11.20 |
| 2005-05 | 29.70 |
| 2005-04 | 30.10 |
| 2005-03 | 23.00 |
| 2005-02 | 24.00 |
| 2005-01 | 64.40 |
| 2004-12 | 23.50 |
| 2004-11 | 46.20 |
| 2004-10 | 0.00 |
| 2004-09 | 7.70 |
| 2004-08 | 27.30 |
| 2004-07 | -26.30 |
| 2004-05 | 0.00 |
| 2004-04 | 15.40 |
| 2004-03 | -28.60 |
| 2004-02 | -38.90 |
| 2004-01 | 7.10 |
| 2003-12 | 14.30 |
| 2003-10 | 13.30 |
| 2003-09 | 18.20 |
| 2003-08 | -8.30 |
| 2003-07 | 80.00 |
| 2003-06 | 15.40 |
| 2003-05 | 9.10 |
| 2003-04 | 9.10 |
| 2003-03 | 66.70 |
| 2003-02 | 100.00 |
| 2003-01 | 27.27 |
| 2002-12 | -22.20 |
| 2002-11 | 18.20 |
| 2002-10 | 36.40 |
| 2002-09 | -15.40 |
| 2002-08 | -7.70 |
| 2002-07 | -23.10 |
| 2002-05 | -26.70 |
| 2002-04 | -21.40 |
| 2002-03 | -14.30 |
| 2002-02 | -30.80 |
| 2002-01 | -26.70 |
| 2001-12 | -10.00 |
| 2001-11 | -35.30 |
| 2001-10 | -38.90 |
| 2001-09 | -27.80 |
| 2001-08 | -31.60 |
| 2001-07 | -27.80 |
| 2001-06 | 61.90 |
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