| 年月 | 单位：% |
| 2008-12 | 16.00 |
| 2008-11 | 17.20 |
| 2008-10 | 18.50 |
| 2008-09 | 20.20 |
| 2008-08 | 22.40 |
| 2008-07 | 27.30 |
| 2008-06 | 21.50 |
| 2008-05 | 18.10 |
| 2008-04 | 13.10 |
| 2008-03 | 14.00 |
| 2008-02 | 10.80 |
| 2008-01 | 39.50 |
| 2007-12 | 25.70 |
| 2007-11 | 25.80 |
| 2007-10 | 25.00 |
| 2007-09 | 23.00 |
| 2007-08 | 21.00 |
| 2007-07 | 19.40 |
| 2007-06 | 19.27 |
| 2007-05 | 19.20 |
| 2007-04 | 14.47 |
| 2007-03 | 12.17 |
| 2007-02 | 12.82 |
| 2007-01 | 10.53 |
| 2006-12 | -0.70 |
| 2006-11 | -3.90 |
| 2006-10 | -4.40 |
| 2006-09 | -3.20 |
| 2006-08 | -0.70 |
| 2006-07 | 0.60 |
| 2006-06 | 0.60 |
| 2006-05 | 1.00 |
| 2006-04 | 4.90 |
| 2006-03 | 10.20 |
| 2006-02 | 9.10 |
| 2006-01 | 7.80 |
| 2005-12 | 40.60 |
| 2005-11 | 40.10 |
| 2005-10 | 41.50 |
| 2005-09 | 45.20 |
| 2005-08 | 40.40 |
| 2005-07 | 40.80 |
| 2005-06 | 43.10 |
| 2005-05 | 33.00 |
| 2005-04 | 33.90 |
| 2005-03 | 35.10 |
| 2005-02 | 41.80 |
| 2005-01 | 64.40 |
| 2004-12 | 0.00 |
| 2004-11 | -3.50 |
| 2004-10 | -7.50 |
| 2004-09 | -6.70 |
| 2004-08 | -9.70 |
| 2004-07 | -11.70 |
| 2004-06 | -9.70 |
| 2004-05 | -10.50 |
| 2004-04 | -13.80 |
| 2004-03 | -21.20 |
| 2004-02 | -18.80 |
| 2004-01 | 7.10 |
| 2003-12 | 21.80 |
| 2003-11 | 22.70 |
| 2003-10 | 33.60 |
| 2003-09 | 30.10 |
| 2003-08 | 35.20 |
| 2003-07 | 44.70 |
| 2003-06 | 39.40 |
| 2003-05 | 46.20 |
| 2003-04 | 52.40 |
| 2003-03 | 62.50 |
| 2003-02 | 6.00 |
| 2003-01 | 27.27 |
| 2002-12 | -12.50 |
| 2002-11 | -12.00 |
| 2002-10 | -13.10 |
| 2002-09 | -17.60 |
| 2002-08 | -20.20 |
| 2002-07 | -24.00 |
| 2002-06 | -23.30 |
| 2002-05 | -28.80 |
| 2002-04 | -26.30 |
| 2002-03 | -25.60 |
| 2002-02 | -28.60 |
| 2002-01 | -26.70 |
| 2001-12 | -29.40 |
| 2001-11 | -31.50 |
| 2001-10 | -32.20 |
| 2001-09 | -33.50 |
| 2001-08 | -32.10 |
| 2001-07 | -32.90 |
| 2001-06 | 66.20 |
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