| 年月 | 单位：% |
| 2010-12 | 20.80 |
| 2010-11 | 12.20 |
| 2010-10 | 17.34 |
| 2010-09 | 6.10 |
| 2010-08 | 2.20 |
| 2010-07 | 6.70 |
| 2010-06 | 16.70 |
| 2010-05 | 19.95 |
| 2010-04 | 14.30 |
| 2010-03 | 12.80 |
| 2010-02 | 8.27 |
| 2010-01 | 73.08 |
| 2009-12 | 12.90 |
| 2009-11 | 26.80 |
| 2009-10 | 11.30 |
| 2009-09 | 18.08 |
| 2009-08 | 15.40 |
| 2009-07 | 9.45 |
| 2009-06 | 12.01 |
| 2009-05 | -2.60 |
| 2009-04 | 12.50 |
| 2009-03 | 0.00 |
| 2009-02 | 19.60 |
| 2009-01 | -24.17 |
| 2008-12 | 4.00 |
| 2008-11 | 154.50 |
| 2008-10 | 0.00 |
| 2008-09 | 5.50 |
| 2008-08 | 4.20 |
| 2008-07 | 10.50 |
| 2008-06 | 17.20 |
| 2008-05 | 28.10 |
| 2008-04 | 15.00 |
| 2008-03 | 29.60 |
| 2008-02 | 7.10 |
| 2008-01 | 3.71 |
| 2007-12 | 9.90 |
| 2007-11 | 17.50 |
| 2007-10 | 16.60 |
| 2007-09 | -3.20 |
| 2007-08 | 11.10 |
| 2007-07 | 26.70 |
| 2007-06 | 12.40 |
| 2007-05 | 4.30 |
| 2007-04 | 19.00 |
| 2007-03 | -8.40 |
| 2007-02 | -4.70 |
| 2007-01 | 30.86 |
| 2006-12 | 17.90 |
| 2006-11 | 7.80 |
| 2006-10 | 18.80 |
| 2006-09 | 16.90 |
| 2006-08 | 12.80 |
| 2006-07 | -1.80 |
| 2006-06 | 16.10 |
| 2006-05 | 31.40 |
| 2006-04 | 19.20 |
| 2006-03 | 5.50 |
| 2006-02 | 12.90 |
| 2006-01 | -3.11 |
| 2005-12 | 18.00 |
| 2005-11 | 29.20 |
| 2005-10 | 23.80 |
| 2005-09 | 11.20 |
| 2005-08 | 9.90 |
| 2005-07 | 1.40 |
| 2005-06 | 2.40 |
| 2005-05 | 8.50 |
| 2005-04 | 14.20 |
| 2005-03 | 25.90 |
| 2005-02 | 0.50 |
| 2005-01 | 10.80 |
| 2004-12 | 12.60 |
| 2004-11 | 2.60 |
| 2004-10 | -4.60 |
| 2004-09 | 8.30 |
| 2004-08 | 14.30 |
| 2004-07 | 12.10 |
| 2004-06 | 12.20 |
| 2004-05 | 5.50 |
| 2004-04 | 5.90 |
| 2004-03 | -6.40 |
| 2004-02 | 51.10 |
| 2004-01 | -12.60 |
| 2003-12 | 19.28 |
| 2003-11 | 21.60 |
| 2003-10 | 15.23 |
| 2003-09 | 9.88 |
| 2003-08 | 11.19 |
| 2003-07 | 16.18 |
| 2003-06 | 22.54 |
| 2003-05 | 22.30 |
| 2003-04 | -6.90 |
| 2003-03 | 131.30 |
| 2003-02 | 23.36 |
| 2003-01 | 14.78 |
| 2002-12 | 22.95 |
| 2002-11 | 14.39 |
| 2002-10 | 12.40 |
| 2002-09 | 14.18 |
| 2002-08 | 19.17 |
| 2002-07 | 15.13 |
| 2002-06 | 17.07 |
| 2002-05 | 23.64 |
| 2002-04 | 24.35 |
| 2002-03 | 12.61 |
| 2002-02 | -2.89 |
| 2002-01 | 12.12 |
| 2001-12 | -1.72 |
| 2001-11 | 1.63 |
| 2001-10 | -0.72 |
| 2001-09 | 5.84 |
| 2001-08 | 3.93 |
| 2001-07 | 2.09 |
| 2001-06 | 1.66 |
| 2001-05 | 2.63 |
| 2001-04 | 3.20 |
| 2001-03 | 6.80 |
| 2001-02 | 18.50 |
| 2001-01 | -5.60 |
| 2000-12 | 11.00 |
| 2000-10 | 1.00 |
| 2000-09 | 19.60 |
| 2000-08 | 24.30 |
| 2000-07 | 17.10 |
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