| 年月 | 单位：% |
| 2009-05 | 24.07 |
| 2009-04 | 28.22 |
| 2009-03 | 33.29 |
| 2009-02 | 17.33 |
| 2009-01 | 9.82 |
| 2008-12 | 12.20 |
| 2008-11 | 11.90 |
| 2008-10 | 10.30 |
| 2008-09 | 10.70 |
| 2008-08 | 12.10 |
| 2008-07 | 14.50 |
| 2008-06 | 11.50 |
| 2008-05 | 12.80 |
| 2008-04 | 13.10 |
| 2008-03 | 10.40 |
| 2008-02 | 9.50 |
| 2008-01 | 11.32 |
| 2007-12 | 21.30 |
| 2007-11 | 21.90 |
| 2007-10 | 24.40 |
| 2007-09 | 21.50 |
| 2007-08 | 20.70 |
| 2007-07 | 18.30 |
| 2007-06 | 17.20 |
| 2007-05 | 16.00 |
| 2007-04 | 16.60 |
| 2007-03 | 15.20 |
| 2007-02 | 12.90 |
| 2007-01 | 24.88 |
| 2006-12 | 29.00 |
| 2006-11 | 28.50 |
| 2006-10 | 28.00 |
| 2006-09 | 27.00 |
| 2006-08 | 25.50 |
| 2006-07 | 23.00 |
| 2006-06 | 25.10 |
| 2006-05 | 24.80 |
| 2006-04 | 25.70 |
| 2006-03 | 32.70 |
| 2006-02 | 31.90 |
| 2006-01 | 21.12 |
| 2005-12 | 29.20 |
| 2005-11 | 30.00 |
| 2005-10 | 27.80 |
| 2005-09 | 27.60 |
| 2005-08 | 26.50 |
| 2005-07 | 31.20 |
| 2005-06 | 30.00 |
| 2005-05 | 29.60 |
| 2005-04 | 27.50 |
| 2005-03 | 27.80 |
| 2005-02 | 29.70 |
| 2005-01 | 56.30 |
| 2004-12 | 28.00 |
| 2004-11 | 28.10 |
| 2004-10 | 29.40 |
| 2004-09 | 30.50 |
| 2004-08 | 34.10 |
| 2004-07 | 34.70 |
| 2004-06 | 37.00 |
| 2004-05 | 39.10 |
| 2004-04 | 40.70 |
| 2004-03 | 41.90 |
| 2004-02 | 29.70 |
| 2004-01 | 41.00 |
| 2003-12 | 35.11 |
| 2003-11 | 35.62 |
| 2003-10 | 35.84 |
| 2003-09 | 36.75 |
| 2003-08 | 37.28 |
| 2003-07 | 40.19 |
| 2003-06 | 42.38 |
| 2003-05 | 46.86 |
| 2003-04 | 56.06 |
| 2003-03 | 55.12 |
| 2003-02 | 48.93 |
| 2003-01 | 16.79 |
| 2002-12 | 44.82 |
| 2002-11 | 47.20 |
| 2002-10 | 48.08 |
| 2002-09 | 49.58 |
| 2002-08 | 51.62 |
| 2002-07 | 57.42 |
| 2002-06 | 56.76 |
| 2002-05 | 53.77 |
| 2002-04 | 44.43 |
| 2002-03 | 40.68 |
| 2002-02 | 48.29 |
| 2002-01 | 38.60 |
| 2001-12 | 24.59 |
| 2001-11 | 22.87 |
| 2001-10 | 21.22 |
| 2001-09 | 18.90 |
| 2001-08 | 17.43 |
| 2001-07 | 15.82 |
| 2001-06 | 13.57 |
| 2001-05 | 12.87 |
| 2001-04 | 14.00 |
| 2001-03 | 21.90 |
| 2001-02 | 17.90 |
| 2001-01 | 33.00 |
| 2000-12 | 33.10 |
| 2000-11 | 30.80 |
| 2000-10 | 29.60 |
| 2000-09 | 28.90 |
| 2000-08 | 27.10 |
| 2000-07 | 25.20 |
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