| 年月 | 单位：% |
| 2004-12 | 12.00 |
| 2004-11 | 12.60 |
| 2004-10 | 12.10 |
| 2004-09 | 12.60 |
| 2004-08 | 12.90 |
| 2004-07 | 11.50 |
| 2004-06 | 14.40 |
| 2004-05 | 14.80 |
| 2004-04 | 20.30 |
| 2004-03 | 24.90 |
| 2004-02 | 22.30 |
| 2004-01 | 11.60 |
| 2003-12 | 18.30 |
| 2003-11 | 17.60 |
| 2003-10 | 17.39 |
| 2003-09 | 17.21 |
| 2003-08 | 17.94 |
| 2003-07 | 16.45 |
| 2003-06 | 15.93 |
| 2003-05 | 15.89 |
| 2003-04 | 14.74 |
| 2003-03 | 12.81 |
| 2003-02 | 12.55 |
| 2003-01 | 13.41 |
| 2002-12 | 12.02 |
| 2002-11 | 11.79 |
| 2002-10 | 11.75 |
| 2002-09 | 13.09 |
| 2002-08 | 12.77 |
| 2002-07 | 12.66 |
| 2002-06 | 12.58 |
| 2002-05 | 12.15 |
| 2002-04 | 8.59 |
| 2002-03 | 7.32 |
| 2002-02 | 8.29 |
| 2002-01 | 9.73 |
| 2001-12 | 7.21 |
| 2001-11 | 5.94 |
| 2001-10 | 5.19 |
| 2001-09 | 4.65 |
| 2001-08 | 5.46 |
| 2001-07 | 6.44 |
| 2001-06 | 10.54 |
| 2001-05 | 12.05 |
| 2001-04 | 13.50 |
| 2001-03 | 11.70 |
| 2001-02 | 8.70 |
| 2001-01 | 5.40 |
| 2000-12 | 9.30 |
| 2000-11 | 8.50 |
| 2000-10 | 7.90 |
| 2000-09 | 6.20 |
| 2000-08 | 6.80 |
| 2000-07 | 6.20 |
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