| 年月 | 单位：% |
| 2008-12 | 2.50 |
| 2008-11 | 4.60 |
| 2008-10 | 6.90 |
| 2008-09 | 8.30 |
| 2008-08 | 8.40 |
| 2008-07 | 11.30 |
| 2008-06 | 14.50 |
| 2008-05 | 19.60 |
| 2008-04 | 18.60 |
| 2008-03 | 16.80 |
| 2008-02 | 8.70 |
| 2008-01 | 36.80 |
| 2007-12 | 1.30 |
| 2007-11 | 0.40 |
| 2007-10 | -0.50 |
| 2007-09 | -0.90 |
| 2007-08 | -0.60 |
| 2007-07 | -0.60 |
| 2007-06 | -4.20 |
| 2007-05 | -4.70 |
| 2007-04 | -5.30 |
| 2007-03 | -13.30 |
| 2007-02 | -6.60 |
| 2007-01 | -31.50 |
| 2006-12 | -14.90 |
| 2006-11 | -15.20 |
| 2006-10 | -14.90 |
| 2006-09 | -14.30 |
| 2006-08 | -16.10 |
| 2006-07 | -18.10 |
| 2006-06 | -21.10 |
| 2006-05 | -19.80 |
| 2006-04 | -20.60 |
| 2006-03 | -15.10 |
| 2006-02 | -17.50 |
| 2006-01 | -8.60 |
| 2005-12 | 15.10 |
| 2005-11 | 18.00 |
| 2005-10 | 19.90 |
| 2005-09 | 21.20 |
| 2005-08 | 26.80 |
| 2005-07 | 26.50 |
| 2005-06 | 34.10 |
| 2005-05 | 28.50 |
| 2005-04 | 24.10 |
| 2005-03 | 25.80 |
| 2005-02 | 39.10 |
| 2005-01 | 37.80 |
| 2004-12 | 29.20 |
| 2004-11 | 27.50 |
| 2004-10 | 24.30 |
| 2004-09 | 25.00 |
| 2004-08 | 25.10 |
| 2004-07 | 29.80 |
| 2004-06 | 28.30 |
| 2004-05 | 25.10 |
| 2004-04 | 29.30 |
| 2004-03 | 26.40 |
| 2004-02 | 16.30 |
| 2004-01 | 16.50 |
| 2003-12 | 27.70 |
| 2003-11 | 29.90 |
| 2003-10 | 33.70 |
| 2003-09 | 34.90 |
| 2003-08 | 35.70 |
| 2003-07 | 32.30 |
| 2003-06 | 34.00 |
| 2003-05 | 33.40 |
| 2003-04 | 31.40 |
| 2003-03 | 32.60 |
| 2003-02 | 38.60 |
| 2003-01 | 29.30 |
| 2002-12 | 20.70 |
| 2002-11 | 17.50 |
| 2002-10 | 15.40 |
| 2002-09 | 11.80 |
| 2002-08 | 9.40 |
| 2002-07 | 6.60 |
| 2002-06 | 0.40 |
| 2002-05 | 0.90 |
| 2002-04 | -1.00 |
| 2002-03 | -3.70 |
| 2002-02 | 3.30 |
| 2002-01 | 32.80 |
| 2001-12 | -5.70 |
| 2001-11 | -6.00 |
| 2001-10 | -5.70 |
| 2001-09 | -3.70 |
| 2001-08 | -4.10 |
| 2001-07 | -3.60 |
| 2001-06 | -0.60 |
| 2001-05 | 2.50 |
| 2001-04 | 9.70 |
| 2001-03 | 15.80 |
| 2001-02 | 20.40 |
| 2001-01 | 11.20 |
| 2000-12 | 17.40 |
| 2000-11 | 18.80 |
| 2000-10 | 20.10 |
| 2000-09 | 20.40 |
| 2000-08 | 20.90 |
| 2000-07 | 23.00 |
| 2000-06 | 22.60 |
| 2000-05 | 17.50 |
| 2000-04 | 13.30 |
| 2000-03 | 8.60 |
| 2000-02 | 10.50 |
| 2000-01 | 11.90 |
| 1999-12 | -5.40 |
| 1999-11 | -4.70 |
| 1999-10 | -6.50 |
| 1999-09 | -8.60 |
| 1999-08 | -8.80 |
| 1999-07 | -10.70 |
| 1999-06 | -9.00 |
| 1999-05 | -10.80 |
| 1999-04 | -10.10 |
| 1999-03 | -8.70 |
| 1999-02 | -5.80 |
| 1999-01 | -8.70 |
| 1998-12 | -20.90 |
| 1998-11 | -22.30 |
| 1998-10 | -21.90 |
| 1998-09 | -21.00 |
| 1998-08 | -18.90 |
| 1998-07 | -17.80 |
| 1998-06 | -16.90 |
| 1998-05 | -11.60 |
| 1998-04 | -4.60 |
| 1998-03 | 3.10 |
| 1998-02 | 3.20 |
| 1998-01 | 40.90 |
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