| 年月 | 单位：% |
| 2010-12 | 16.80 |
| 2010-11 | 16.60 |
| 2010-10 | 16.80 |
| 2010-09 | 14.80 |
| 2010-08 | 15.90 |
| 2010-07 | 16.60 |
| 2010-06 | 18.10 |
| 2010-05 | 19.08 |
| 2010-04 | 23.90 |
| 2010-03 | 28.40 |
| 2010-02 | 38.49 |
| 2010-01 | 73.08 |
| 2009-12 | 10.00 |
| 2009-11 | 7.00 |
| 2009-10 | 4.70 |
| 2009-09 | 4.83 |
| 2009-08 | 3.00 |
| 2009-07 | 2.15 |
| 2009-06 | 0.27 |
| 2009-05 | -3.50 |
| 2009-04 | -4.00 |
| 2009-03 | -5.60 |
| 2009-02 | -6.10 |
| 2009-01 | -24.17 |
| 2008-12 | 11.90 |
| 2008-11 | 28.00 |
| 2008-10 | 13.60 |
| 2008-09 | 15.80 |
| 2008-08 | 17.10 |
| 2008-07 | 17.70 |
| 2008-06 | 19.10 |
| 2008-05 | 17.80 |
| 2008-04 | 14.00 |
| 2008-03 | 12.00 |
| 2008-02 | 4.40 |
| 2008-01 | 3.71 |
| 2007-12 | 12.70 |
| 2007-11 | 12.10 |
| 2007-10 | 11.90 |
| 2007-09 | 9.10 |
| 2007-08 | 10.40 |
| 2007-07 | 9.80 |
| 2007-06 | 7.80 |
| 2007-05 | 6.90 |
| 2007-04 | 9.10 |
| 2007-03 | 5.10 |
| 2007-02 | 12.00 |
| 2007-01 | 30.86 |
| 2006-12 | 10.20 |
| 2006-11 | 9.60 |
| 2006-10 | 10.20 |
| 2006-09 | 11.40 |
| 2006-08 | 9.70 |
| 2006-07 | 9.20 |
| 2006-06 | 11.60 |
| 2006-05 | 11.10 |
| 2006-04 | 7.90 |
| 2006-03 | 5.10 |
| 2006-02 | 3.40 |
| 2006-01 | -3.11 |
| 2005-12 | 17.20 |
| 2005-11 | 13.60 |
| 2005-10 | 12.40 |
| 2005-09 | 11.20 |
| 2005-08 | 10.20 |
| 2005-07 | 10.50 |
| 2005-06 | 13.00 |
| 2005-05 | 15.90 |
| 2005-04 | 17.30 |
| 2005-03 | 18.00 |
| 2005-02 | 14.20 |
| 2005-01 | 10.80 |
| 2004-12 | 7.10 |
| 2004-11 | 6.40 |
| 2004-10 | 6.80 |
| 2004-09 | 8.00 |
| 2004-08 | 8.20 |
| 2004-07 | 7.20 |
| 2004-06 | 6.30 |
| 2004-05 | 5.70 |
| 2004-04 | 5.10 |
| 2004-03 | 5.40 |
| 2004-02 | 14.40 |
| 2004-01 | -12.60 |
| 2003-12 | 16.71 |
| 2003-11 | 17.03 |
| 2003-10 | 17.02 |
| 2003-09 | 18.68 |
| 2003-08 | 21.51 |
| 2003-07 | 23.98 |
| 2003-06 | 27.26 |
| 2003-05 | 29.65 |
| 2003-04 | 34.57 |
| 2003-03 | 58.89 |
| 2003-02 | 20.18 |
| 2003-01 | 14.78 |
| 2002-12 | 9.13 |
| 2002-11 | 17.36 |
| 2002-10 | 17.88 |
| 2002-09 | 18.26 |
| 2002-08 | 19.28 |
| 2002-07 | 19.04 |
| 2002-06 | 20.03 |
| 2002-05 | 19.89 |
| 2002-04 | 18.96 |
| 2002-03 | 6.81 |
| 2002-02 | 3.46 |
| 2002-01 | 12.12 |
| 2001-12 | 3.06 |
| 2001-11 | 3.85 |
| 2001-10 | 4.15 |
| 2001-09 | 4.75 |
| 2001-08 | 4.55 |
| 2001-07 | 5.99 |
| 2001-06 | 6.36 |
| 2001-05 | 5.31 |
| 2001-04 | 6.00 |
| 2001-03 | 7.60 |
| 2001-02 | 8.10 |
| 2001-01 | -5.60 |
| 2000-12 | 12.40 |
| 2000-11 | 11.30 |
| 2000-10 | 12.70 |
| 2000-09 | 14.30 |
| 2000-08 | 13.50 |
| 2000-07 | 11.00 |
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