| 年月 | 单位：% |
| 2010-12 | 19.70 |
| 2010-11 | 20.70 |
| 2010-10 | 19.86 |
| 2010-09 | 19.50 |
| 2010-08 | 24.50 |
| 2010-07 | 26.50 |
| 2010-06 | 33.90 |
| 2010-05 | 20.65 |
| 2010-04 | 37.20 |
| 2010-03 | 41.50 |
| 2010-02 | 59.33 |
| 2010-01 | 64.37 |
| 2009-12 | 13.10 |
| 2009-11 | 10.60 |
| 2009-10 | 8.50 |
| 2009-09 | 4.86 |
| 2009-08 | 1.50 |
| 2009-07 | -1.09 |
| 2009-06 | -1.32 |
| 2009-05 | -9.10 |
| 2009-04 | -9.20 |
| 2009-03 | -11.20 |
| 2009-02 | -13.80 |
| 2009-01 | -20.86 |
| 2008-12 | -10.20 |
| 2008-11 | -9.00 |
| 2008-10 | -8.70 |
| 2008-09 | -5.80 |
| 2008-08 | -2.20 |
| 2008-07 | -0.70 |
| 2008-06 | 1.00 |
| 2008-05 | 1.90 |
| 2008-04 | 2.50 |
| 2008-03 | 3.00 |
| 2008-02 | -3.60 |
| 2008-01 | -3.30 |
| 2007-12 | 13.20 |
| 2007-11 | 13.60 |
| 2007-10 | 13.70 |
| 2007-09 | 14.70 |
| 2007-08 | 11.90 |
| 2007-07 | 12.70 |
| 2007-06 | 12.70 |
| 2007-05 | 12.30 |
| 2007-04 | 10.70 |
| 2007-03 | 7.00 |
| 2007-02 | 23.90 |
| 2007-01 | 35.49 |
| 2006-12 | 8.90 |
| 2006-11 | 8.50 |
| 2006-10 | 8.50 |
| 2006-09 | 8.20 |
| 2006-08 | 8.20 |
| 2006-07 | 8.10 |
| 2006-06 | 8.40 |
| 2006-05 | 5.80 |
| 2006-04 | 4.70 |
| 2006-03 | 5.80 |
| 2006-02 | -0.90 |
| 2006-01 | -9.78 |
| 2005-12 | 5.70 |
| 2005-11 | 7.10 |
| 2005-10 | 7.10 |
| 2005-09 | 7.70 |
| 2005-08 | 8.80 |
| 2005-07 | 10.60 |
| 2005-06 | 12.30 |
| 2005-05 | 11.60 |
| 2005-04 | 12.00 |
| 2005-03 | 10.20 |
| 2005-02 | 13.60 |
| 2005-01 | 36.40 |
| 2004-12 | 13.00 |
| 2004-11 | 10.90 |
| 2004-10 | 11.20 |
| 2004-09 | 12.00 |
| 2004-08 | 11.70 |
| 2004-07 | 10.90 |
| 2004-06 | 8.50 |
| 2004-05 | 9.60 |
| 2004-04 | 9.10 |
| 2004-03 | 8.00 |
| 2004-02 | 8.20 |
| 2004-01 | 2.80 |
| 2003-12 | 9.88 |
| 2003-11 | 11.39 |
| 2003-10 | 10.94 |
| 2003-09 | 12.03 |
| 2003-08 | 13.03 |
| 2003-07 | 14.22 |
| 2003-06 | 13.53 |
| 2003-05 | 13.87 |
| 2003-04 | 14.81 |
| 2003-03 | 16.92 |
| 2003-02 | 18.50 |
| 2003-01 | 6.45 |
| 2002-12 | 7.75 |
| 2002-11 | 6.09 |
| 2002-10 | 5.79 |
| 2002-09 | 3.39 |
| 2002-08 | 3.66 |
| 2002-07 | 3.30 |
| 2002-06 | 2.45 |
| 2002-05 | 1.62 |
| 2002-04 | -1.03 |
| 2002-03 | -1.96 |
| 2002-02 | 2.71 |
| 2002-01 | 18.56 |
| 2001-12 | 5.61 |
| 2001-11 | 5.57 |
| 2001-10 | 6.25 |
| 2001-09 | 8.56 |
| 2001-08 | 9.63 |
| 2001-07 | 10.03 |
| 2001-06 | 12.66 |
| 2001-05 | 13.88 |
| 2001-04 | 15.80 |
| 2001-03 | 8.90 |
| 2001-02 | 10.90 |
| 2001-01 | 3.40 |
| 2000-12 | 19.50 |
| 2000-11 | 18.90 |
| 2000-10 | 18.60 |
| 2000-09 | 17.50 |
| 2000-08 | 17.80 |
| 2000-07 | 16.90 |
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