| 年月 | 单位：% |
| 2009-05 | 15.89 |
| 2009-04 | 23.58 |
| 2009-03 | 52.71 |
| 2009-02 | 25.18 |
| 2009-01 | 9.82 |
| 2008-12 | 14.80 |
| 2008-11 | 16.90 |
| 2008-10 | 6.70 |
| 2008-09 | 3.10 |
| 2008-08 | 12.80 |
| 2008-07 | 24.50 |
| 2008-06 | 7.80 |
| 2008-05 | 11.30 |
| 2008-04 | 20.10 |
| 2008-03 | 18.70 |
| 2008-02 | 7.50 |
| 2008-01 | 11.32 |
| 2007-12 | 15.10 |
| 2007-11 | 21.20 |
| 2007-10 | 30.00 |
| 2007-09 | 24.80 |
| 2007-08 | 23.80 |
| 2007-07 | 18.90 |
| 2007-06 | 24.80 |
| 2007-05 | 17.10 |
| 2007-04 | 11.90 |
| 2007-03 | 12.70 |
| 2007-02 | 2.40 |
| 2007-01 | 24.88 |
| 2006-12 | 35.90 |
| 2006-11 | 41.80 |
| 2006-10 | 40.00 |
| 2006-09 | 37.70 |
| 2006-08 | 25.80 |
| 2006-07 | 23.50 |
| 2006-06 | 23.40 |
| 2006-05 | 18.20 |
| 2006-04 | 16.20 |
| 2006-03 | 36.70 |
| 2006-02 | 44.50 |
| 2006-01 | 21.12 |
| 2005-12 | 41.20 |
| 2005-11 | 56.80 |
| 2005-10 | 26.10 |
| 2005-09 | 36.10 |
| 2005-08 | 12.90 |
| 2005-07 | 36.30 |
| 2005-06 | 33.70 |
| 2005-05 | 35.40 |
| 2005-04 | 25.70 |
| 2005-03 | 22.60 |
| 2005-02 | 6.60 |
| 2005-01 | 56.30 |
| 2004-12 | 22.40 |
| 2004-11 | 11.00 |
| 2004-10 | 21.30 |
| 2004-09 | 20.50 |
| 2004-08 | 28.00 |
| 2004-07 | 23.10 |
| 2004-06 | 37.80 |
| 2004-05 | 31.80 |
| 2004-04 | 37.30 |
| 2004-03 | 62.40 |
| 2004-02 | 27.90 |
| 2004-01 | 41.00 |
| 2003-12 | 30.21 |
| 2003-11 | 31.04 |
| 2003-10 | 26.41 |
| 2003-09 | 23.89 |
| 2003-08 | 24.07 |
| 2003-07 | 40.12 |
| 2003-06 | 28.90 |
| 2003-05 | 21.55 |
| 2003-04 | 51.23 |
| 2003-03 | 58.65 |
| 2003-02 | 68.86 |
| 2003-01 | 16.79 |
| 2002-12 | 25.87 |
| 2002-11 | 31.85 |
| 2002-10 | 30.37 |
| 2002-09 | 37.55 |
| 2002-08 | 31.24 |
| 2002-07 | 27.29 |
| 2002-06 | 75.27 |
| 2002-05 | 76.39 |
| 2002-04 | 55.27 |
| 2002-03 | 34.81 |
| 2002-02 | 57.00 |
| 2002-01 | 38.60 |
| 2001-12 | 26.01 |
| 2001-11 | 33.10 |
| 2001-10 | 32.14 |
| 2001-09 | 28.60 |
| 2001-08 | 26.48 |
| 2001-07 | 32.58 |
| 2001-06 | 19.49 |
| 2001-05 | 9.58 |
| 2001-03 | 20.00 |
| 2001-02 | 21.10 |
| 2001-01 | 33.00 |
| 2000-12 | 46.80 |
| 2000-11 | 19.40 |
| 2000-10 | 37.80 |
| 2000-09 | 33.90 |
| 2000-08 | 37.10 |
| 2000-07 | 33.90 |
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