| 年月 | 单位：% |
| 2009-12 | 30.14 |
| 2009-11 | 28.98 |
| 2009-10 | 31.14 |
| 2009-09 | 30.90 |
| 2009-08 | 31.70 |
| 2009-07 | 31.00 |
| 2009-06 | 31.90 |
| 2009-05 | 31.60 |
| 2009-04 | 30.10 |
| 2009-03 | 35.00 |
| 2009-02 | 35.80 |
| 2009-01 | 39.80 |
| 2008-12 | 73.90 |
| 2008-11 | 75.80 |
| 2008-10 | 73.70 |
| 2008-09 | 71.60 |
| 2008-08 | 66.70 |
| 2008-07 | 64.50 |
| 2008-06 | 64.80 |
| 2008-05 | 68.40 |
| 2008-04 | 63.90 |
| 2008-03 | 65.30 |
| 2008-02 | 65.20 |
| 2008-01 | 81.00 |
| 2007-12 | 71.30 |
| 2007-11 | 69.40 |
| 2007-10 | 71.70 |
| 2007-09 | 73.20 |
| 2007-08 | 70.20 |
| 2007-07 | 67.50 |
| 2007-06 | 64.46 |
| 2007-05 | 51.70 |
| 2007-04 | 46.96 |
| 2007-03 | 51.72 |
| 2007-02 | 56.36 |
| 2007-01 | 55.56 |
| 2006-12 | 19.20 |
| 2006-11 | 15.70 |
| 2006-10 | 16.30 |
| 2006-09 | 18.10 |
| 2006-08 | 22.70 |
| 2006-07 | 27.80 |
| 2006-06 | 30.70 |
| 2006-05 | 31.30 |
| 2006-04 | 31.10 |
| 2006-03 | 37.60 |
| 2006-02 | 35.70 |
| 2006-01 | 5.60 |
| 2005-12 | 38.90 |
| 2005-11 | 44.70 |
| 2005-10 | 47.50 |
| 2005-09 | 46.60 |
| 2005-08 | 51.00 |
| 2005-07 | 51.20 |
| 2005-06 | 44.50 |
| 2005-05 | 46.40 |
| 2005-04 | 52.70 |
| 2005-03 | 53.20 |
| 2005-02 | 52.20 |
| 2005-01 | 85.20 |
| 2004-12 | -7.30 |
| 2004-11 | 0.90 |
| 2004-10 | 1.10 |
| 2004-09 | -5.70 |
| 2004-08 | -6.70 |
| 2004-07 | -10.30 |
| 2004-06 | 0.00 |
| 2004-05 | -2.20 |
| 2004-03 | -19.40 |
| 2004-02 | -18.20 |
| 2004-01 | -30.80 |
| 2003-12 | 14.30 |
| 2003-11 | 3.90 |
| 2003-10 | 3.30 |
| 2003-09 | 11.50 |
| 2003-08 | 10.30 |
| 2003-07 | 11.70 |
| 2003-06 | -1.90 |
| 2003-05 | -6.30 |
| 2003-04 | -12.80 |
| 2003-03 | -3.20 |
| 2003-02 | 4.80 |
| 2003-01 | 8.33 |
| 2002-12 | -18.50 |
| 2002-11 | -14.90 |
| 2002-10 | -13.50 |
| 2002-09 | -11.40 |
| 2002-08 | -6.80 |
| 2002-07 | -7.70 |
| 2002-06 | -5.30 |
| 2002-05 | -2.00 |
| 2002-04 | -4.90 |
| 2002-03 | -3.10 |
| 2002-02 | -4.50 |
| 2002-01 | 20.00 |
| 2001-12 | -9.30 |
| 2001-11 | -12.30 |
| 2001-10 | -13.30 |
| 2001-09 | -17.00 |
| 2001-08 | -21.50 |
| 2001-07 | -27.80 |
| 2001-06 | 76.00 |
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