| 年月 | 单位：% |
| 2010-12 | 18.20 |
| 2010-11 | 37.50 |
| 2010-10 | 44.77 |
| 2010-09 | 28.10 |
| 2010-08 | 28.70 |
| 2010-07 | 38.00 |
| 2010-06 | 31.10 |
| 2010-05 | 37.41 |
| 2010-04 | 42.30 |
| 2010-03 | 16.40 |
| 2010-02 | 26.58 |
| 2010-01 | 57.65 |
| 2009-12 | 47.10 |
| 2009-11 | 32.90 |
| 2009-10 | 69.20 |
| 2009-09 | 58.83 |
| 2009-08 | 20.50 |
| 2009-07 | 26.22 |
| 2009-06 | 17.99 |
| 2009-05 | 28.50 |
| 2009-04 | 12.30 |
| 2009-03 | 12.40 |
| 2009-02 | 6.00 |
| 2009-01 | 30.42 |
| 2008-12 | -15.70 |
| 2008-11 | 15.20 |
| 2008-10 | 8.50 |
| 2008-09 | -0.30 |
| 2008-08 | 8.10 |
| 2008-07 | 8.40 |
| 2008-06 | 13.20 |
| 2008-05 | 11.30 |
| 2008-04 | 16.80 |
| 2008-03 | 20.10 |
| 2008-02 | 7.40 |
| 2008-01 | 9.71 |
| 2007-12 | 29.60 |
| 2007-11 | 25.10 |
| 2007-10 | 22.70 |
| 2007-09 | 30.90 |
| 2007-08 | 45.00 |
| 2007-07 | 18.80 |
| 2007-06 | 20.70 |
| 2007-05 | 27.90 |
| 2007-04 | 18.00 |
| 2007-03 | 7.70 |
| 2007-02 | -1.40 |
| 2007-01 | 22.20 |
| 2006-12 | 19.80 |
| 2006-11 | 9.20 |
| 2006-10 | -1.70 |
| 2006-09 | 17.10 |
| 2006-08 | 11.30 |
| 2006-07 | 20.60 |
| 2006-06 | 36.90 |
| 2006-05 | 30.90 |
| 2006-04 | 42.70 |
| 2006-03 | 51.30 |
| 2006-02 | 35.70 |
| 2006-01 | 29.67 |
| 2005-12 | 25.90 |
| 2005-11 | 22.80 |
| 2005-10 | 13.80 |
| 2005-09 | 8.90 |
| 2005-08 | 14.40 |
| 2005-07 | 16.90 |
| 2005-06 | 5.70 |
| 2005-05 | 4.90 |
| 2005-04 | -6.50 |
| 2005-03 | -6.70 |
| 2005-02 | -3.10 |
| 2005-01 | 9.60 |
| 2004-12 | 19.50 |
| 2004-11 | 17.00 |
| 2004-10 | 2.40 |
| 2004-09 | 10.40 |
| 2004-08 | 3.80 |
| 2004-07 | 11.90 |
| 2004-06 | -21.30 |
| 2004-05 | 21.90 |
| 2004-04 | 20.80 |
| 2004-03 | 13.70 |
| 2004-02 | 3.00 |
| 2004-01 | 1.60 |
| 2003-12 | 1.03 |
| 2003-11 | -4.50 |
| 2003-10 | 2.72 |
| 2003-09 | 15.51 |
| 2003-08 | 5.76 |
| 2003-07 | 9.79 |
| 2003-06 | 36.75 |
| 2003-05 | -8.56 |
| 2003-04 | 4.73 |
| 2003-03 | 12.99 |
| 2003-02 | 18.89 |
| 2003-01 | 8.76 |
| 2002-12 | 26.10 |
| 2002-11 | 14.44 |
| 2002-10 | 48.32 |
| 2002-09 | 7.67 |
| 2002-08 | 14.83 |
| 2002-07 | 13.32 |
| 2002-06 | 9.27 |
| 2002-05 | 5.68 |
| 2002-04 | 16.24 |
| 2002-03 | 8.90 |
| 2002-02 | -3.84 |
| 2002-01 | 9.81 |
| 2001-12 | 6.12 |
| 2001-11 | 13.33 |
| 2001-10 | 11.53 |
| 2001-09 | 9.50 |
| 2001-08 | 3.84 |
| 2001-07 | -0.44 |
| 2001-06 | 15.36 |
| 2001-05 | 17.92 |
| 2001-04 | 6.40 |
| 2001-03 | 15.40 |
| 2001-02 | 32.50 |
| 2001-01 | -1.10 |
| 2000-12 | -0.60 |
| 2000-11 | 13.10 |
| 2000-10 | 13.20 |
| 2000-09 | 8.70 |
| 2000-08 | 5.50 |
| 2000-07 | 22.50 |
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