| 年月 | 单位：% |
| 2007-12 | -8.70 |
| 2007-11 | -10.80 |
| 2007-10 | -13.00 |
| 2007-09 | -13.90 |
| 2007-08 | -14.40 |
| 2007-07 | -11.20 |
| 2007-06 | -12.90 |
| 2007-05 | -13.10 |
| 2007-04 | -11.00 |
| 2007-03 | -5.10 |
| 2007-02 | 26.10 |
| 2007-01 | -2.90 |
| 2006-12 | 16.50 |
| 2006-11 | 16.90 |
| 2006-10 | 17.40 |
| 2006-09 | 18.40 |
| 2006-08 | 22.60 |
| 2006-07 | 23.80 |
| 2006-06 | 25.40 |
| 2006-05 | 27.70 |
| 2006-04 | 29.70 |
| 2006-03 | 22.20 |
| 2006-02 | 17.10 |
| 2006-01 | 17.20 |
| 2005-12 | 47.10 |
| 2005-11 | 45.60 |
| 2005-10 | 48.20 |
| 2005-09 | 47.40 |
| 2005-08 | 40.60 |
| 2005-07 | 33.10 |
| 2005-06 | 31.30 |
| 2005-05 | 27.70 |
| 2005-04 | 16.30 |
| 2005-03 | 12.00 |
| 2005-02 | 8.00 |
| 2005-01 | 4.20 |
| 2004-12 | 10.40 |
| 2004-11 | 15.70 |
| 2004-10 | 16.70 |
| 2004-09 | 18.70 |
| 2004-08 | 21.60 |
| 2004-07 | 24.20 |
| 2004-06 | 26.70 |
| 2004-05 | 24.30 |
| 2004-04 | 29.70 |
| 2004-03 | 34.90 |
| 2004-02 | 31.00 |
| 2004-01 | 40.10 |
| 2003-12 | 10.20 |
| 2003-11 | 9.50 |
| 2003-10 | 8.80 |
| 2003-09 | 8.40 |
| 2003-08 | 7.60 |
| 2003-07 | 6.20 |
| 2003-06 | 2.50 |
| 2003-05 | 0.20 |
| 2003-04 | 0.40 |
| 2003-03 | -1.90 |
| 2003-02 | -2.70 |
| 2003-01 | -3.50 |
| 2002-12 | 6.10 |
| 2002-11 | 2.30 |
| 2002-10 | 2.00 |
| 2002-09 | 0.00 |
| 2002-08 | -1.10 |
| 2002-07 | -1.40 |
| 2002-06 | -3.30 |
| 2002-05 | -4.20 |
| 2002-04 | -6.90 |
| 2002-03 | -10.90 |
| 2002-02 | -7.30 |
| 2002-01 | 9.90 |
| 2001-12 | -17.40 |
| 2001-11 | -17.40 |
| 2001-10 | -19.00 |
| 2001-09 | -17.90 |
| 2001-08 | -16.60 |
| 2001-07 | -15.20 |
| 2001-06 | -15.20 |
| 2001-05 | -11.30 |
| 2001-04 | -10.00 |
| 2001-03 | 0.00 |
| 2001-02 | 3.60 |
| 2001-01 | -2.60 |
| 2000-12 | 7.30 |
| 2000-11 | 8.10 |
| 2000-10 | 11.00 |
| 2000-09 | 12.20 |
| 2000-08 | 12.00 |
| 2000-07 | 12.00 |
| 2000-06 | 19.10 |
| 2000-05 | 15.70 |
| 2000-04 | 18.80 |
| 2000-03 | 14.80 |
| 2000-02 | 20.30 |
| 2000-01 | 37.10 |
| 1999-12 | -20.60 |
| 1999-11 | -20.40 |
| 1999-10 | -22.50 |
| 1999-09 | -24.10 |
| 1999-08 | -24.50 |
| 1999-07 | -24.70 |
| 1999-06 | -27.40 |
| 1999-05 | -25.00 |
| 1999-04 | -25.00 |
| 1999-03 | -22.20 |
| 1999-02 | -26.60 |
| 1999-01 | -24.00 |
| 1998-12 | -14.70 |
| 1998-11 | -15.80 |
| 1998-10 | -14.60 |
| 1998-09 | -12.20 |
| 1998-08 | -10.30 |
| 1998-07 | -9.90 |
| 1998-06 | -8.40 |
| 1998-05 | -9.50 |
| 1998-04 | -7.60 |
| 1998-03 | -11.10 |
| 1998-02 | -13.70 |
| 1998-01 | -13.30 |
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