| 年月 | 单位：% |
| 2004-12 | 5.70 |
| 2004-11 | 13.10 |
| 2004-10 | 8.40 |
| 2004-09 | 7.30 |
| 2004-08 | 11.80 |
| 2004-07 | 8.90 |
| 2004-06 | 8.30 |
| 2004-05 | 2.60 |
| 2004-04 | 12.00 |
| 2004-03 | 29.60 |
| 2004-02 | 33.20 |
| 2004-01 | 11.60 |
| 2003-12 | 24.43 |
| 2003-11 | 18.92 |
| 2003-10 | 17.12 |
| 2003-09 | 12.46 |
| 2003-08 | 29.38 |
| 2003-07 | 17.47 |
| 2003-06 | 12.47 |
| 2003-05 | 19.90 |
| 2003-04 | 18.51 |
| 2003-03 | 12.17 |
| 2003-02 | 10.13 |
| 2003-01 | 13.41 |
| 2002-12 | 14.54 |
| 2002-11 | 14.98 |
| 2002-10 | 14.74 |
| 2002-09 | 15.79 |
| 2002-08 | 15.93 |
| 2002-07 | 13.07 |
| 2002-06 | 20.16 |
| 2002-05 | 19.03 |
| 2002-04 | 12.70 |
| 2002-03 | 4.56 |
| 2002-02 | 1.41 |
| 2002-01 | 9.73 |
| 2001-12 | -1.11 |
| 2001-11 | 11.89 |
| 2001-10 | 12.35 |
| 2001-09 | -0.91 |
| 2001-08 | -6.56 |
| 2001-07 | -16.18 |
| 2001-06 | 2.37 |
| 2001-05 | 5.40 |
| 2001-04 | 19.60 |
| 2001-03 | 16.50 |
| 2001-02 | 12.80 |
| 2001-01 | 5.40 |
| 2000-12 | 17.80 |
| 2000-11 | 17.30 |
| 2000-10 | 19.60 |
| 2000-09 | 3.70 |
| 2000-08 | 6.90 |
| 2000-07 | 6.40 |
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