| 年月 | 单位：% |
| 2007-12 | -13.20 |
| 2007-11 | -8.60 |
| 2007-10 | -15.70 |
| 2007-09 | -20.30 |
| 2007-08 | -24.30 |
| 2007-07 | -24.60 |
| 2007-06 | -25.20 |
| 2007-05 | -21.20 |
| 2007-04 | -13.20 |
| 2007-03 | 3.30 |
| 2007-02 | -16.00 |
| 2007-01 | -22.80 |
| 2006-12 | -14.50 |
| 2006-11 | -16.60 |
| 2006-10 | -14.00 |
| 2006-09 | -7.20 |
| 2006-08 | -12.70 |
| 2006-07 | -8.10 |
| 2006-06 | -9.90 |
| 2006-05 | -10.60 |
| 2006-04 | -16.00 |
| 2006-03 | -12.10 |
| 2006-02 | 38.50 |
| 2006-01 | 46.80 |
| 2005-12 | 44.00 |
| 2005-11 | 48.60 |
| 2005-10 | 51.80 |
| 2005-09 | 42.80 |
| 2005-08 | 53.40 |
| 2005-07 | 61.80 |
| 2005-06 | 66.70 |
| 2005-05 | 56.90 |
| 2005-04 | 59.20 |
| 2005-03 | 5.90 |
| 2005-02 | -14.90 |
| 2005-01 | 49.00 |
| 2004-12 | 19.30 |
| 2004-11 | 15.20 |
| 2004-10 | 20.10 |
| 2004-09 | 24.70 |
| 2004-08 | 17.10 |
| 2004-07 | 15.20 |
| 2004-06 | 6.40 |
| 2004-05 | -2.30 |
| 2004-04 | 0.20 |
| 2004-03 | 13.80 |
| 2004-02 | 14.50 |
| 2004-01 | -13.90 |
| 2003-12 | -16.90 |
| 2003-11 | -14.50 |
| 2003-10 | -20.00 |
| 2003-09 | -24.90 |
| 2003-08 | -26.80 |
| 2003-07 | -36.40 |
| 2003-06 | -36.40 |
| 2003-05 | -24.60 |
| 2003-04 | -31.40 |
| 2003-03 | -36.50 |
| 2003-02 | -38.20 |
| 2003-01 | -50.20 |
| 2002-12 | 9.40 |
| 2002-11 | 7.80 |
| 2002-10 | 4.80 |
| 2002-09 | 10.30 |
| 2002-08 | 16.80 |
| 2002-07 | 20.70 |
| 2002-06 | 21.60 |
| 2002-05 | 3.80 |
| 2002-04 | -0.30 |
| 2002-03 | -5.20 |
| 2002-02 | -27.70 |
| 2002-01 | 130.60 |
| 2001-12 | -49.80 |
| 2001-11 | -49.40 |
| 2001-10 | -45.80 |
| 2001-09 | -46.00 |
| 2001-08 | -48.40 |
| 2001-07 | -41.20 |
| 2001-06 | -36.10 |
| 2001-05 | -40.60 |
| 2001-04 | -45.70 |
| 2001-03 | -33.60 |
| 2001-02 | 25.30 |
| 2001-01 | -20.80 |
| 2000-12 | 38.30 |
| 2000-11 | 29.40 |
| 2000-10 | 18.10 |
| 2000-09 | 13.80 |
| 2000-08 | 33.90 |
| 2000-07 | 10.40 |
| 2000-06 | 4.40 |
| 2000-05 | 0.40 |
| 2000-04 | 17.20 |
| 2000-03 | -6.40 |
| 2000-02 | -44.90 |
| 2000-01 | -81.70 |
| 1999-12 | -36.90 |
| 1999-11 | -32.70 |
| 1999-10 | -28.40 |
| 1999-09 | -18.40 |
| 1999-08 | -33.70 |
| 1999-07 | -31.70 |
| 1999-06 | -34.50 |
| 1999-05 | -30.70 |
| 1999-04 | -25.70 |
| 1999-03 | -17.20 |
| 1999-02 | 13.20 |
| 1999-01 | 36.50 |
| 1998-12 | 46.80 |
| 1998-11 | 39.50 |
| 1998-10 | 33.00 |
| 1998-09 | 16.70 |
| 1998-08 | 28.80 |
| 1998-07 | 44.50 |
| 1998-06 | 46.00 |
| 1998-05 | 37.90 |
| 1998-04 | 28.10 |
| 1998-03 | 48.50 |
| 1998-02 | 40.10 |
| 1998-01 | 47.00 |
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