| 年月 | 单位：% |
| 2008-12 | -19.70 |
| 2008-11 | -18.70 |
| 2008-10 | -17.80 |
| 2008-09 | -18.50 |
| 2008-08 | -19.20 |
| 2008-07 | -18.30 |
| 2008-06 | -18.70 |
| 2008-05 | -17.60 |
| 2008-04 | -18.10 |
| 2008-03 | -18.30 |
| 2008-02 | -16.20 |
| 2008-01 | -17.00 |
| 2007-12 | -8.20 |
| 2007-11 | -7.70 |
| 2007-10 | -7.30 |
| 2007-09 | -6.40 |
| 2007-08 | -4.80 |
| 2007-07 | -4.50 |
| 2007-06 | -2.80 |
| 2007-05 | -0.60 |
| 2007-04 | 0.00 |
| 2007-03 | 1.00 |
| 2007-02 | 6.10 |
| 2007-01 | 26.20 |
| 2006-12 | -5.00 |
| 2006-11 | -4.30 |
| 2006-10 | -4.40 |
| 2006-09 | -4.20 |
| 2006-08 | -5.30 |
| 2006-07 | -5.40 |
| 2006-06 | -5.70 |
| 2006-05 | -6.20 |
| 2006-04 | -6.20 |
| 2006-03 | -4.30 |
| 2006-02 | -3.90 |
| 2006-01 | -13.50 |
| 2005-12 | -2.50 |
| 2005-11 | -1.30 |
| 2005-10 | -0.30 |
| 2005-09 | -0.10 |
| 2005-08 | 0.00 |
| 2005-07 | -0.20 |
| 2005-06 | 0.70 |
| 2005-05 | 1.20 |
| 2005-04 | 2.20 |
| 2005-03 | -0.70 |
| 2005-02 | -3.20 |
| 2005-01 | 18.20 |
| 2004-12 | 3.60 |
| 2004-11 | 3.20 |
| 2004-10 | 1.90 |
| 2004-09 | 1.70 |
| 2004-08 | 2.80 |
| 2004-07 | 1.30 |
| 2004-06 | -0.20 |
| 2004-05 | -2.70 |
| 2004-04 | -3.20 |
| 2004-03 | -7.00 |
| 2004-02 | -12.00 |
| 2004-01 | -31.30 |
| 2003-12 | 3.10 |
| 2003-11 | 1.40 |
| 2003-10 | 1.60 |
| 2003-09 | 1.00 |
| 2003-08 | 0.90 |
| 2003-07 | 2.80 |
| 2003-06 | 4.90 |
| 2003-05 | 7.50 |
| 2003-04 | 7.80 |
| 2003-03 | 11.40 |
| 2003-02 | 9.20 |
| 2003-01 | 9.00 |
| 2002-12 | 6.80 |
| 2002-11 | 6.70 |
| 2002-10 | 6.30 |
| 2002-09 | 5.90 |
| 2002-08 | 6.10 |
| 2002-07 | 4.60 |
| 2002-06 | 2.50 |
| 2002-05 | 1.30 |
| 2002-04 | 1.00 |
| 2002-03 | -0.20 |
| 2002-02 | 8.30 |
| 2002-01 | 41.40 |
| 2001-12 | -3.10 |
| 2001-11 | -2.90 |
| 2001-10 | -3.00 |
| 2001-09 | -2.00 |
| 2001-08 | -2.50 |
| 2001-07 | -1.10 |
| 2001-06 | -0.30 |
| 2001-05 | 0.40 |
| 2001-04 | -1.00 |
| 2001-03 | -1.60 |
| 2001-02 | -8.10 |
| 2001-01 | -32.10 |
| 2000-12 | -0.70 |
| 2000-11 | -0.50 |
| 2000-10 | 1.00 |
| 2000-09 | 0.30 |
| 2000-08 | 0.80 |
| 2000-07 | 0.50 |
| 2000-06 | 1.70 |
| 2000-05 | 1.50 |
| 2000-04 | 3.90 |
| 2000-03 | 7.70 |
| 2000-02 | 17.10 |
| 2000-01 | 18.80 |
| 1999-12 | 2.30 |
| 1999-11 | 2.00 |
| 1999-10 | 0.20 |
| 1999-09 | 0.20 |
| 1999-08 | 0.60 |
| 1999-07 | 0.90 |
| 1999-06 | -0.30 |
| 1999-05 | 0.90 |
| 1999-04 | 2.00 |
| 1999-03 | -1.40 |
| 1999-02 | -0.50 |
| 1999-01 | 13.20 |
| 1998-12 | -5.30 |
| 1998-11 | -4.20 |
| 1998-10 | -4.00 |
| 1998-09 | -2.80 |
| 1998-08 | -4.20 |
| 1998-07 | -5.50 |
| 1998-06 | -5.60 |
| 1998-05 | -6.00 |
| 1998-04 | -4.50 |
| 1998-03 | -2.70 |
| 1998-02 | -4.90 |
| 1998-01 | -18.70 |
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