| 年月 | 单位：% |
| 2006-12 | -32.90 |
| 2006-11 | -35.80 |
| 2006-10 | -35.60 |
| 2006-09 | -33.20 |
| 2006-08 | -36.20 |
| 2006-07 | -37.50 |
| 2006-06 | -31.60 |
| 2006-05 | -35.40 |
| 2006-04 | -37.60 |
| 2006-03 | -20.70 |
| 2006-02 | -21.50 |
| 2006-01 | -44.10 |
| 2005-12 | 4.20 |
| 2005-11 | -1.10 |
| 2005-10 | -0.20 |
| 2005-09 | 5.70 |
| 2005-08 | 4.80 |
| 2005-07 | 6.20 |
| 2005-06 | -1.30 |
| 2005-05 | -5.70 |
| 2005-04 | -1.90 |
| 2005-03 | -20.90 |
| 2005-02 | -20.70 |
| 2005-01 | 2.50 |
| 2004-12 | -32.20 |
| 2004-11 | -33.90 |
| 2004-10 | -31.70 |
| 2004-09 | -35.30 |
| 2004-08 | -34.90 |
| 2004-07 | -35.40 |
| 2004-06 | -34.40 |
| 2004-05 | -27.80 |
| 2004-04 | -32.10 |
| 2004-03 | -38.40 |
| 2004-02 | -36.80 |
| 2004-01 | 171.70 |
| 2003-12 | -9.00 |
| 2003-11 | -3.40 |
| 2003-10 | -6.30 |
| 2003-09 | -7.60 |
| 2003-08 | -7.70 |
| 2003-07 | -7.10 |
| 2003-06 | -8.10 |
| 2003-05 | -14.90 |
| 2003-04 | -20.80 |
| 2003-03 | 13.30 |
| 2003-02 | -10.50 |
| 2003-01 | -19.50 |
| 2002-12 | -42.80 |
| 2002-11 | -43.20 |
| 2002-10 | -41.20 |
| 2002-09 | -37.40 |
| 2002-08 | -37.20 |
| 2002-07 | -36.60 |
| 2002-06 | -35.80 |
| 2002-05 | -33.60 |
| 2002-04 | -26.50 |
| 2002-03 | -47.00 |
| 2002-02 | 39.10 |
| 2002-01 | -67.70 |
| 2001-12 | -30.00 |
| 2001-11 | -32.40 |
| 2001-10 | -35.80 |
| 2001-09 | -35.70 |
| 2001-08 | -35.80 |
| 2001-07 | -36.40 |
| 2001-06 | -36.60 |
| 2001-05 | -36.50 |
| 2001-04 | -29.40 |
| 2001-03 | -31.70 |
| 2001-02 | -60.90 |
| 2001-01 | 132.40 |
| 2000-12 | -0.90 |
| 2000-11 | 10.50 |
| 2000-10 | 23.20 |
| 2000-09 | 21.70 |
| 2000-08 | 22.80 |
| 2000-07 | 24.20 |
| 2000-06 | 26.70 |
| 2000-05 | 34.70 |
| 2000-04 | 23.60 |
| 2000-03 | 25.60 |
| 2000-02 | 30.80 |
| 2000-01 | -62.40 |
| 1999-12 | -35.70 |
| 1999-11 | -37.20 |
| 1999-10 | -43.90 |
| 1999-09 | -44.00 |
| 1999-08 | -44.10 |
| 1999-07 | -43.90 |
| 1999-06 | -44.00 |
| 1999-05 | -44.00 |
| 1999-04 | -47.20 |
| 1999-03 | -45.20 |
| 1999-02 | -50.60 |
| 1999-01 | -68.60 |
| 1998-12 | -57.70 |
| 1998-11 | -60.20 |
| 1998-10 | -59.30 |
| 1998-09 | -58.40 |
| 1998-08 | -57.60 |
| 1998-07 | -56.00 |
| 1998-06 | -55.80 |
| 1998-05 | -59.50 |
| 1998-04 | -61.20 |
| 1998-03 | -60.40 |
| 1998-02 | -44.80 |
| 1998-01 | -33.90 |
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