| 年月 | 单位：% |
| 2009-12 | 10.56 |
| 2009-11 | 9.79 |
| 2009-10 | 9.69 |
| 2009-09 | 9.90 |
| 2009-08 | 10.00 |
| 2009-07 | 10.60 |
| 2009-06 | 12.90 |
| 2009-05 | 13.20 |
| 2009-04 | 12.70 |
| 2009-03 | 11.40 |
| 2009-02 | 11.20 |
| 2009-01 | 8.70 |
| 2008-12 | -12.40 |
| 2008-11 | -11.70 |
| 2008-10 | -11.60 |
| 2008-09 | -11.70 |
| 2008-08 | -12.50 |
| 2008-07 | -11.90 |
| 2008-06 | -11.30 |
| 2008-05 | -9.40 |
| 2008-04 | -14.10 |
| 2008-03 | -13.60 |
| 2008-02 | -11.70 |
| 2008-01 | -9.80 |
| 2007-12 | 25.80 |
| 2007-11 | 24.90 |
| 2007-10 | 25.00 |
| 2007-09 | 24.80 |
| 2007-08 | 24.70 |
| 2007-07 | 25.70 |
| 2007-06 | 24.92 |
| 2007-05 | 22.50 |
| 2007-04 | 20.96 |
| 2007-03 | 21.07 |
| 2007-02 | 21.61 |
| 2007-01 | 20.19 |
| 2006-12 | 14.20 |
| 2006-11 | 14.50 |
| 2006-10 | 15.00 |
| 2006-09 | 14.20 |
| 2006-08 | 13.30 |
| 2006-07 | 12.70 |
| 2006-06 | 13.10 |
| 2006-05 | 14.40 |
| 2006-04 | 15.70 |
| 2006-03 | 14.60 |
| 2006-02 | 12.70 |
| 2006-01 | 13.80 |
| 2005-12 | 15.50 |
| 2005-11 | 16.40 |
| 2005-10 | 15.90 |
| 2005-09 | 16.40 |
| 2005-08 | 16.20 |
| 2005-07 | 16.50 |
| 2005-06 | 16.70 |
| 2005-05 | 9.40 |
| 2005-04 | 10.00 |
| 2005-03 | 11.60 |
| 2005-02 | 19.20 |
| 2005-01 | 27.50 |
| 2004-12 | 16.90 |
| 2004-11 | 15.30 |
| 2004-10 | 15.70 |
| 2004-09 | 14.00 |
| 2004-08 | 13.20 |
| 2004-07 | 11.80 |
| 2004-06 | 11.50 |
| 2004-05 | 11.90 |
| 2004-04 | 8.40 |
| 2004-03 | 3.40 |
| 2004-02 | -7.10 |
| 2004-01 | -19.70 |
| 2003-12 | 8.90 |
| 2003-11 | 8.70 |
| 2003-10 | 7.80 |
| 2003-09 | 6.50 |
| 2003-08 | 6.10 |
| 2003-07 | 5.60 |
| 2003-06 | 2.10 |
| 2003-05 | 2.20 |
| 2003-04 | 0.40 |
| 2003-03 | 2.40 |
| 2003-02 | 11.60 |
| 2003-01 | 18.18 |
| 2002-12 | -7.20 |
| 2002-11 | -5.70 |
| 2002-10 | -5.70 |
| 2002-09 | -5.40 |
| 2002-08 | -5.60 |
| 2002-07 | -5.30 |
| 2002-06 | -3.50 |
| 2002-05 | -4.20 |
| 2002-04 | -3.00 |
| 2002-03 | -4.00 |
| 2002-02 | -8.20 |
| 2002-01 | -9.70 |
| 2001-12 | 1.30 |
| 2001-10 | 0.70 |
| 2001-09 | 1.40 |
| 2001-08 | 1.80 |
| 2001-07 | 1.50 |
| 2001-06 | 100.60 |
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