| 年月 | 单位：% |
| 2009-12 | 15.28 |
| 2009-11 | 11.40 |
| 2009-10 | 13.58 |
| 2009-09 | 10.10 |
| 2009-08 | 3.60 |
| 2009-07 | -5.50 |
| 2009-06 | 4.80 |
| 2009-05 | 0.50 |
| 2009-04 | 5.50 |
| 2009-03 | -1.40 |
| 2009-02 | -0.80 |
| 2009-01 | -0.50 |
| 2008-12 | 5.00 |
| 2008-11 | -0.80 |
| 2008-10 | 2.40 |
| 2008-09 | 9.00 |
| 2008-08 | 47.70 |
| 2008-07 | 20.70 |
| 2008-06 | -3.20 |
| 2008-05 | 11.80 |
| 2008-04 | 8.70 |
| 2008-03 | 8.40 |
| 2008-02 | 18.00 |
| 2008-01 | 7.60 |
| 2007-12 | 5.50 |
| 2007-11 | 23.80 |
| 2007-10 | 18.40 |
| 2007-09 | 27.00 |
| 2007-08 | 20.10 |
| 2007-07 | 21.80 |
| 2007-06 | 55.30 |
| 2007-05 | 47.80 |
| 2007-04 | 48.82 |
| 2007-03 | 26.49 |
| 2007-02 | 10.64 |
| 2007-01 | 22.44 |
| 2006-12 | 2.50 |
| 2006-11 | 4.80 |
| 2006-10 | 4.70 |
| 2006-09 | 0.20 |
| 2006-08 | 7.50 |
| 2006-07 | -1.40 |
| 2006-06 | 1.10 |
| 2006-05 | 6.70 |
| 2006-04 | -2.50 |
| 2006-03 | 1.50 |
| 2006-02 | 14.30 |
| 2006-01 | 19.90 |
| 2005-12 | 14.00 |
| 2005-11 | 30.60 |
| 2005-10 | 26.00 |
| 2005-09 | 38.40 |
| 2005-08 | 26.60 |
| 2005-07 | 24.90 |
| 2005-06 | 17.50 |
| 2005-05 | 3.60 |
| 2005-04 | -3.20 |
| 2005-03 | 9.90 |
| 2005-02 | -6.90 |
| 2005-01 | -6.90 |
| 2004-12 | 6.60 |
| 2004-11 | 11.00 |
| 2004-10 | 1.20 |
| 2004-09 | 2.50 |
| 2004-08 | 7.90 |
| 2004-07 | 8.00 |
| 2004-06 | 19.80 |
| 2004-05 | 39.00 |
| 2004-04 | 47.40 |
| 2004-03 | 45.90 |
| 2004-02 | 59.60 |
| 2004-01 | 45.40 |
| 2003-12 | 51.00 |
| 2003-11 | 38.50 |
| 2003-10 | 45.60 |
| 2003-09 | 48.10 |
| 2003-08 | 55.10 |
| 2003-07 | 79.10 |
| 2003-06 | 82.30 |
| 2003-05 | 53.80 |
| 2003-04 | 71.40 |
| 2003-03 | 91.30 |
| 2003-02 | 70.80 |
| 2003-01 | 97.68 |
| 2002-12 | 105.10 |
| 2002-11 | 111.30 |
| 2002-10 | 112.20 |
| 2002-09 | 108.50 |
| 2002-08 | 74.50 |
| 2002-07 | 68.60 |
| 2002-06 | 62.50 |
| 2002-05 | 59.60 |
| 2002-04 | 35.50 |
| 2002-03 | 12.40 |
| 2002-02 | 21.10 |
| 2002-01 | 20.90 |
| 2001-12 | -13.70 |
| 2001-11 | -8.00 |
| 2001-10 | -3.60 |
| 2001-09 | 2.00 |
| 2001-08 | 8.80 |
| 2001-07 | 2.70 |
| 2001-06 | 109.60 |
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