| 年月 | 单位：% |
| 2008-12 | 44.90 |
| 2008-11 | 44.60 |
| 2008-10 | 46.40 |
| 2008-09 | 53.70 |
| 2008-08 | 58.10 |
| 2008-07 | 56.30 |
| 2008-06 | 40.70 |
| 2008-05 | 36.70 |
| 2008-04 | 23.80 |
| 2008-03 | 17.90 |
| 2008-02 | -30.20 |
| 2008-01 | -27.60 |
| 2007-12 | 45.60 |
| 2007-11 | 50.50 |
| 2007-10 | 41.20 |
| 2007-09 | 40.90 |
| 2007-08 | 35.80 |
| 2007-07 | 35.30 |
| 2007-06 | 40.48 |
| 2007-05 | 36.10 |
| 2007-04 | 55.56 |
| 2007-03 | 65.00 |
| 2007-02 | 276.92 |
| 2007-01 | 228.57 |
| 2006-12 | -9.20 |
| 2006-11 | -3.90 |
| 2006-10 | -2.70 |
| 2006-09 | 1.20 |
| 2006-08 | 2.30 |
| 2006-07 | 2.80 |
| 2006-06 | -4.00 |
| 2006-05 | -5.90 |
| 2006-04 | -6.50 |
| 2006-03 | -9.40 |
| 2006-02 | -20.20 |
| 2006-01 | -25.20 |
| 2005-12 | 6.30 |
| 2005-11 | 8.30 |
| 2005-10 | 8.70 |
| 2005-09 | 9.20 |
| 2005-08 | 8.60 |
| 2005-07 | 10.40 |
| 2005-06 | 10.80 |
| 2005-05 | 2.50 |
| 2005-04 | 3.50 |
| 2005-03 | -10.30 |
| 2005-02 | -9.70 |
| 2005-01 | 34.20 |
| 2004-12 | 49.10 |
| 2004-11 | 31.40 |
| 2004-10 | 33.30 |
| 2004-09 | 30.80 |
| 2004-08 | 29.40 |
| 2004-07 | 27.60 |
| 2004-06 | 11.10 |
| 2004-05 | 9.10 |
| 2004-03 | 0.00 |
| 2004-02 | -22.20 |
| 2004-01 | -20.00 |
| 2003-12 | 47.20 |
| 2003-11 | 53.10 |
| 2003-10 | 46.70 |
| 2003-09 | 46.20 |
| 2003-08 | 43.50 |
| 2003-07 | 40.00 |
| 2003-06 | 58.80 |
| 2003-05 | 69.20 |
| 2003-04 | 70.00 |
| 2003-03 | 50.00 |
| 2003-02 | 50.00 |
| 2003-01 | 25.00 |
| 2002-12 | -20.00 |
| 2002-11 | -22.00 |
| 2002-10 | -18.90 |
| 2002-09 | -18.80 |
| 2002-08 | -17.90 |
| 2002-07 | -20.00 |
| 2002-06 | -22.70 |
| 2002-05 | -27.80 |
| 2002-04 | -28.60 |
| 2002-03 | -27.30 |
| 2002-02 | -25.00 |
| 2002-01 | -25.00 |
| 2001-11 | 2.50 |
| 2001-10 | 2.80 |
| 2001-09 | -8.60 |
| 2001-08 | -12.50 |
| 2001-07 | -13.80 |
| 2001-06 | 88.00 |
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