| 年月 | 单位：% |
| 2007-12 | 26.70 |
| 2007-11 | 32.00 |
| 2007-10 | 17.80 |
| 2007-09 | 8.90 |
| 2007-08 | 0.80 |
| 2007-07 | -1.40 |
| 2007-06 | -4.90 |
| 2007-05 | -4.20 |
| 2007-04 | 1.80 |
| 2007-03 | 16.00 |
| 2007-02 | -8.70 |
| 2007-01 | -16.50 |
| 2006-12 | -27.50 |
| 2006-11 | -31.20 |
| 2006-10 | -30.80 |
| 2006-09 | -27.70 |
| 2006-08 | -34.60 |
| 2006-07 | -34.40 |
| 2006-06 | -39.00 |
| 2006-05 | -43.80 |
| 2006-04 | -47.80 |
| 2006-03 | -43.80 |
| 2006-02 | -7.80 |
| 2006-01 | -2.90 |
| 2005-12 | 45.90 |
| 2005-11 | 58.10 |
| 2005-10 | 68.90 |
| 2005-09 | 64.40 |
| 2005-08 | 80.30 |
| 2005-07 | 101.80 |
| 2005-06 | 118.70 |
| 2005-05 | 118.00 |
| 2005-04 | 125.50 |
| 2005-03 | 52.70 |
| 2005-02 | 20.10 |
| 2005-01 | 119.50 |
| 2004-12 | 92.30 |
| 2004-11 | 82.70 |
| 2004-10 | 88.00 |
| 2004-09 | 99.60 |
| 2004-08 | 95.60 |
| 2004-07 | 93.30 |
| 2004-06 | 76.50 |
| 2004-05 | 61.10 |
| 2004-04 | 64.30 |
| 2004-03 | 91.10 |
| 2004-02 | 98.90 |
| 2004-01 | 44.90 |
| 2003-12 | -11.10 |
| 2003-11 | -9.80 |
| 2003-10 | -17.10 |
| 2003-09 | -25.30 |
| 2003-08 | -31.40 |
| 2003-07 | -43.30 |
| 2003-06 | -44.30 |
| 2003-05 | -33.30 |
| 2003-04 | -39.00 |
| 2003-03 | -44.90 |
| 2003-02 | -45.60 |
| 2003-01 | -56.70 |
| 2002-12 | -15.70 |
| 2002-11 | -16.60 |
| 2002-10 | -18.00 |
| 2002-09 | -12.60 |
| 2002-08 | -7.00 |
| 2002-07 | -3.80 |
| 2002-06 | -2.50 |
| 2002-05 | -17.10 |
| 2002-04 | -18.30 |
| 2002-03 | -19.80 |
| 2002-02 | -39.40 |
| 2002-01 | 76.60 |
| 2001-12 | -37.90 |
| 2001-11 | -36.20 |
| 2001-10 | -30.90 |
| 2001-09 | -31.50 |
| 2001-08 | -34.60 |
| 2001-07 | -25.70 |
| 2001-06 | -19.60 |
| 2001-05 | -26.50 |
| 2001-04 | -34.70 |
| 2001-03 | -24.10 |
| 2001-02 | 36.10 |
| 2001-01 | 9.10 |
| 2000-12 | 19.00 |
| 2000-11 | 8.70 |
| 2000-10 | -2.70 |
| 2000-09 | -7.50 |
| 2000-08 | 4.40 |
| 2000-07 | -14.90 |
| 2000-06 | -21.70 |
| 2000-05 | -25.80 |
| 2000-04 | -13.50 |
| 2000-03 | -32.00 |
| 2000-02 | -59.20 |
| 2000-01 | -88.20 |
| 1999-12 | -49.60 |
| 1999-11 | -46.00 |
| 1999-10 | -42.10 |
| 1999-09 | -34.20 |
| 1999-08 | -44.30 |
| 1999-07 | -42.10 |
| 1999-06 | -42.70 |
| 1999-05 | -38.10 |
| 1999-04 | -33.10 |
| 1999-03 | -22.70 |
| 1999-02 | 6.90 |
| 1999-01 | 28.80 |
| 1998-12 | 36.10 |
| 1998-11 | 29.60 |
| 1998-10 | 23.80 |
| 1998-09 | 9.40 |
| 1998-08 | 19.30 |
| 1998-07 | 32.70 |
| 1998-06 | 32.60 |
| 1998-05 | 24.30 |
| 1998-04 | 14.10 |
| 1998-03 | 33.50 |
| 1998-02 | 31.50 |
| 1998-01 | 32.60 |
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