| 年月 | 单位：% |
| 2006-12 | 39.40 |
| 2006-11 | 48.70 |
| 2006-10 | 53.90 |
| 2006-09 | 60.60 |
| 2006-08 | 68.80 |
| 2006-07 | 66.70 |
| 2006-06 | 68.90 |
| 2006-05 | 79.60 |
| 2006-04 | 89.10 |
| 2006-03 | 103.60 |
| 2006-02 | 131.80 |
| 2006-01 | 201.90 |
| 2005-12 | 1040.20 |
| 2005-11 | 929.60 |
| 2005-10 | 915.00 |
| 2005-09 | 854.40 |
| 2005-08 | 827.40 |
| 2005-07 | 836.10 |
| 2005-06 | 799.50 |
| 2005-05 | 725.90 |
| 2005-04 | 677.70 |
| 2005-03 | 494.10 |
| 2005-02 | 277.00 |
| 2005-01 | -25.20 |
| 2004-12 | -14.80 |
| 2004-11 | -12.50 |
| 2004-10 | -15.20 |
| 2004-09 | -16.00 |
| 2004-08 | -18.10 |
| 2004-07 | -26.10 |
| 2004-06 | -26.20 |
| 2004-05 | -28.50 |
| 2004-04 | -28.30 |
| 2004-03 | -34.00 |
| 2004-02 | -40.60 |
| 2004-01 | -59.10 |
| 2003-12 | -26.00 |
| 2003-11 | -27.40 |
| 2003-10 | -27.10 |
| 2003-09 | -25.20 |
| 2003-08 | -24.70 |
| 2003-07 | -19.50 |
| 2003-06 | -15.30 |
| 2003-05 | -14.70 |
| 2003-04 | -10.40 |
| 2003-03 | -7.60 |
| 2003-02 | -2.30 |
| 2003-01 | 6.40 |
| 2002-12 | -2.50 |
| 2002-11 | -0.80 |
| 2002-10 | 0.90 |
| 2002-09 | -1.50 |
| 2002-08 | -3.00 |
| 2002-07 | -0.40 |
| 2002-06 | -6.00 |
| 2002-05 | -8.00 |
| 2002-04 | -16.70 |
| 2002-03 | -12.00 |
| 2002-02 | -1.20 |
| 2002-01 | 10.00 |
| 2001-12 | -9.20 |
| 2001-11 | -12.10 |
| 2001-10 | -11.20 |
| 2001-09 | -10.90 |
| 2001-08 | -8.30 |
| 2001-07 | -8.80 |
| 2001-06 | -4.10 |
| 2001-05 | -0.60 |
| 2001-04 | 17.70 |
| 2001-03 | 19.70 |
| 2001-02 | 23.40 |
| 2001-01 | 0.00 |
| 2000-12 | 16.40 |
| 2000-11 | 21.70 |
| 2000-10 | 17.10 |
| 2000-09 | 24.50 |
| 2000-08 | 26.80 |
| 2000-07 | 31.20 |
| 2000-06 | 29.40 |
| 2000-05 | 22.10 |
| 2000-04 | 13.40 |
| 2000-03 | 8.10 |
| 2000-02 | 12.10 |
| 2000-01 | -0.50 |
| 1999-12 | -14.10 |
| 1999-11 | -8.40 |
| 1999-10 | -9.20 |
| 1999-09 | -15.00 |
| 1999-08 | -17.90 |
| 1999-07 | -24.80 |
| 1999-06 | -25.90 |
| 1999-05 | -20.10 |
| 1999-04 | -24.50 |
| 1999-03 | -23.00 |
| 1999-02 | -40.10 |
| 1999-01 | -26.20 |
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