| 年月 | 单位：% |
| 2008-12 | 25.70 |
| 2008-11 | 29.10 |
| 2008-10 | 32.70 |
| 2008-09 | 31.60 |
| 2008-08 | 30.20 |
| 2008-07 | 30.70 |
| 2008-06 | 33.60 |
| 2008-05 | 33.00 |
| 2008-04 | 27.80 |
| 2008-03 | 33.90 |
| 2008-02 | 51.40 |
| 2008-01 | 55.60 |
| 2007-12 | 9.60 |
| 2007-11 | 8.30 |
| 2007-10 | 7.50 |
| 2007-09 | 7.40 |
| 2007-08 | 8.30 |
| 2007-07 | 7.20 |
| 2007-06 | 1.92 |
| 2007-05 | 3.20 |
| 2007-04 | 2.11 |
| 2007-03 | 0.99 |
| 2007-02 | 5.45 |
| 2007-01 | 23.21 |
| 2006-12 | 7.40 |
| 2006-11 | 8.30 |
| 2006-10 | 6.30 |
| 2006-09 | 7.10 |
| 2006-08 | 7.90 |
| 2006-07 | 9.70 |
| 2006-06 | 13.70 |
| 2006-05 | 12.40 |
| 2006-04 | 10.40 |
| 2006-03 | 11.40 |
| 2006-02 | -4.90 |
| 2006-01 | -22.80 |
| 2005-12 | 45.10 |
| 2005-11 | 68.80 |
| 2005-10 | 73.30 |
| 2005-09 | 76.20 |
| 2005-08 | 61.70 |
| 2005-07 | 54.30 |
| 2005-06 | 51.40 |
| 2005-05 | 25.50 |
| 2005-04 | 33.00 |
| 2005-03 | 17.10 |
| 2005-02 | 32.20 |
| 2005-01 | 55.00 |
| 2004-12 | 30.20 |
| 2004-11 | 32.00 |
| 2004-10 | 32.10 |
| 2004-09 | 31.80 |
| 2004-08 | 34.30 |
| 2004-07 | 31.70 |
| 2004-06 | 38.30 |
| 2004-05 | 39.40 |
| 2004-04 | 33.30 |
| 2004-03 | 25.00 |
| 2004-02 | 0.00 |
| 2004-01 | 4.80 |
| 2003-12 | 21.40 |
| 2003-11 | 21.10 |
| 2003-10 | 19.50 |
| 2003-09 | 20.50 |
| 2003-08 | 22.50 |
| 2003-07 | 25.50 |
| 2003-06 | 29.20 |
| 2003-05 | 36.20 |
| 2003-04 | 38.90 |
| 2003-03 | 45.00 |
| 2003-02 | 63.00 |
| 2003-01 | 17.65 |
| 2002-12 | 38.30 |
| 2002-11 | 38.60 |
| 2002-10 | 43.80 |
| 2002-09 | 42.50 |
| 2002-08 | 35.80 |
| 2002-07 | 27.90 |
| 2002-06 | 21.90 |
| 2002-05 | 21.10 |
| 2002-04 | 20.00 |
| 2002-03 | 25.00 |
| 2002-02 | 42.10 |
| 2002-01 | 70.00 |
| 2001-12 | -24.30 |
| 2001-11 | -27.50 |
| 2001-10 | -30.90 |
| 2001-09 | -36.90 |
| 2001-08 | -37.90 |
| 2001-07 | -37.20 |
| 2001-06 | 60.30 |
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