| 年月 | 单位：% |
| 2007-12 | -22.30 |
| 2007-11 | -23.10 |
| 2007-10 | -24.40 |
| 2007-09 | -24.50 |
| 2007-08 | -23.70 |
| 2007-07 | -19.60 |
| 2007-06 | -18.70 |
| 2007-05 | -17.00 |
| 2007-04 | -13.60 |
| 2007-03 | -10.80 |
| 2007-02 | 13.70 |
| 2007-01 | -14.80 |
| 2006-12 | 10.60 |
| 2006-11 | 11.60 |
| 2006-10 | 11.80 |
| 2006-09 | 12.50 |
| 2006-08 | 14.90 |
| 2006-07 | 15.20 |
| 2006-06 | 14.80 |
| 2006-05 | 13.60 |
| 2006-04 | 14.00 |
| 2006-03 | 8.50 |
| 2006-02 | 7.90 |
| 2006-01 | 12.80 |
| 2005-12 | 33.10 |
| 2005-11 | 31.30 |
| 2005-10 | 34.60 |
| 2005-09 | 33.80 |
| 2005-08 | 30.20 |
| 2005-07 | 24.30 |
| 2005-06 | 26.70 |
| 2005-05 | 28.50 |
| 2005-04 | 21.40 |
| 2005-03 | 22.60 |
| 2005-02 | 21.20 |
| 2005-01 | 22.00 |
| 2004-12 | -0.30 |
| 2004-11 | 2.90 |
| 2004-10 | 2.40 |
| 2004-09 | 3.10 |
| 2004-08 | 4.20 |
| 2004-07 | 6.40 |
| 2004-06 | 6.80 |
| 2004-05 | 5.20 |
| 2004-04 | 9.70 |
| 2004-03 | 9.50 |
| 2004-02 | 4.00 |
| 2004-01 | 6.80 |
| 2003-12 | 2.60 |
| 2003-11 | 0.90 |
| 2003-10 | -0.30 |
| 2003-09 | -0.70 |
| 2003-08 | -0.70 |
| 2003-07 | -2.90 |
| 2003-06 | -5.90 |
| 2003-05 | -8.90 |
| 2003-04 | -9.90 |
| 2003-03 | -13.00 |
| 2003-02 | -13.00 |
| 2003-01 | -11.90 |
| 2002-12 | 9.00 |
| 2002-11 | 9.00 |
| 2002-10 | 11.00 |
| 2002-09 | 10.90 |
| 2002-08 | 10.40 |
| 2002-07 | 12.10 |
| 2002-06 | 11.90 |
| 2002-05 | 12.50 |
| 2002-04 | 9.50 |
| 2002-03 | 7.90 |
| 2002-02 | 16.10 |
| 2002-01 | 37.90 |
| 2001-12 | -11.60 |
| 2001-11 | -13.30 |
| 2001-10 | -16.10 |
| 2001-09 | -16.40 |
| 2001-08 | -15.60 |
| 2001-07 | -15.20 |
| 2001-06 | -16.50 |
| 2001-05 | -13.70 |
| 2001-04 | -12.80 |
| 2001-03 | -3.30 |
| 2001-02 | -4.70 |
| 2001-01 | -12.60 |
| 2000-12 | -9.20 |
| 2000-11 | -8.70 |
| 2000-10 | -6.70 |
| 2000-09 | -5.70 |
| 2000-08 | -5.70 |
| 2000-07 | -4.70 |
| 2000-06 | 1.70 |
| 2000-05 | -1.00 |
| 2000-04 | 2.20 |
| 2000-03 | 1.40 |
| 2000-02 | 15.60 |
| 2000-01 | 39.10 |
| 1999-12 | -9.40 |
| 1999-11 | -7.60 |
| 1999-10 | -8.70 |
| 1999-09 | -9.10 |
| 1999-08 | -9.00 |
| 1999-07 | -9.00 |
| 1999-06 | -11.00 |
| 1999-05 | -6.80 |
| 1999-04 | -4.80 |
| 1999-03 | -2.50 |
| 1999-02 | -11.50 |
| 1999-01 | -13.30 |
| 1998-12 | 0.70 |
| 1998-11 | -1.50 |
| 1998-10 | -0.40 |
| 1998-09 | 0.80 |
| 1998-08 | 2.40 |
| 1998-07 | 1.90 |
| 1998-06 | 1.80 |
| 1998-05 | -0.10 |
| 1998-04 | 0.30 |
| 1998-03 | -4.50 |
| 1998-02 | -10.20 |
| 1998-01 | -11.80 |
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