| 年月 | 单位：% |
| 2010-12 | 13.60 |
| 2010-11 | 19.70 |
| 2010-10 | 20.49 |
| 2010-09 | -4.70 |
| 2010-08 | 8.30 |
| 2010-07 | 0.00 |
| 2010-06 | 38.80 |
| 2010-05 | 14.44 |
| 2010-04 | 26.80 |
| 2010-03 | 18.40 |
| 2010-02 | 50.00 |
| 2010-01 | 64.37 |
| 2009-12 | 45.90 |
| 2009-11 | 33.50 |
| 2009-10 | 52.50 |
| 2009-09 | 34.91 |
| 2009-08 | 19.10 |
| 2009-07 | 8.49 |
| 2009-06 | 17.26 |
| 2009-05 | -0.50 |
| 2009-04 | -1.70 |
| 2009-03 | -6.40 |
| 2009-02 | -6.30 |
| 2009-01 | -20.86 |
| 2008-12 | -17.70 |
| 2008-11 | -15.80 |
| 2008-10 | -37.20 |
| 2008-09 | -28.60 |
| 2008-08 | -13.00 |
| 2008-07 | -7.20 |
| 2008-06 | -7.30 |
| 2008-05 | -3.50 |
| 2008-04 | 1.10 |
| 2008-03 | 15.30 |
| 2008-02 | -3.90 |
| 2008-01 | -3.30 |
| 2007-12 | 9.00 |
| 2007-11 | -0.10 |
| 2007-10 | 12.20 |
| 2007-09 | 25.10 |
| 2007-08 | 8.10 |
| 2007-07 | 10.10 |
| 2007-06 | 12.30 |
| 2007-05 | 13.80 |
| 2007-04 | 18.20 |
| 2007-03 | 5.80 |
| 2007-02 | 13.50 |
| 2007-01 | 35.49 |
| 2006-12 | 14.20 |
| 2006-11 | 8.20 |
| 2006-10 | 11.30 |
| 2006-09 | 7.60 |
| 2006-08 | 7.90 |
| 2006-07 | 8.10 |
| 2006-06 | 20.10 |
| 2006-05 | 10.20 |
| 2006-04 | 5.40 |
| 2006-03 | 8.90 |
| 2006-02 | 10.30 |
| 2006-01 | -9.78 |
| 2005-12 | -8.70 |
| 2005-11 | 6.70 |
| 2005-10 | 4.00 |
| 2005-09 | 1.30 |
| 2005-08 | -1.60 |
| 2005-07 | 1.00 |
| 2005-06 | 11.90 |
| 2005-05 | 10.60 |
| 2005-04 | 10.30 |
| 2005-03 | 5.90 |
| 2005-02 | -6.40 |
| 2005-01 | 36.40 |
| 2004-12 | 23.20 |
| 2004-11 | 7.70 |
| 2004-10 | 3.90 |
| 2004-09 | 11.80 |
| 2004-08 | 20.60 |
| 2004-07 | 21.60 |
| 2004-06 | 4.00 |
| 2004-05 | 9.00 |
| 2004-04 | 12.10 |
| 2004-03 | 9.40 |
| 2004-02 | 17.50 |
| 2004-01 | 2.80 |
| 2003-12 | 8.39 |
| 2003-11 | 11.44 |
| 2003-10 | 1.90 |
| 2003-09 | 8.48 |
| 2003-08 | 11.90 |
| 2003-07 | 18.66 |
| 2003-06 | 11.92 |
| 2003-05 | 10.37 |
| 2003-04 | 9.99 |
| 2003-03 | 12.53 |
| 2003-02 | 21.46 |
| 2003-01 | 6.45 |
| 2002-12 | 6.82 |
| 2002-11 | 10.29 |
| 2002-10 | 15.59 |
| 2002-09 | 2.66 |
| 2002-08 | 5.49 |
| 2002-07 | 8.66 |
| 2002-06 | 6.50 |
| 2002-05 | 10.67 |
| 2002-04 | 1.06 |
| 2002-03 | -8.35 |
| 2002-02 | -11.24 |
| 2002-01 | 18.56 |
| 2001-12 | 0.25 |
| 2001-11 | -0.89 |
| 2001-10 | -7.32 |
| 2001-09 | 1.33 |
| 2001-08 | 5.59 |
| 2001-07 | -4.12 |
| 2001-06 | 8.18 |
| 2001-05 | 6.84 |
| 2001-04 | 18.10 |
| 2001-03 | 11.80 |
| 2001-02 | 20.50 |
| 2001-01 | 3.40 |
| 2000-12 | 21.10 |
| 2000-11 | 16.70 |
| 2000-10 | 28.60 |
| 2000-09 | 15.30 |
| 2000-08 | 24.20 |
| 2000-07 | 24.00 |
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