| 年月 | 单位：% |
| 2008-12 | -50.40 |
| 2008-11 | -45.50 |
| 2008-10 | -37.70 |
| 2008-09 | -7.60 |
| 2008-08 | -21.90 |
| 2008-07 | 21.20 |
| 2008-06 | 18.00 |
| 2008-05 | 19.70 |
| 2008-04 | 15.40 |
| 2008-03 | 30.60 |
| 2008-02 | 32.60 |
| 2008-01 | 20.72 |
| 2007-12 | 40.40 |
| 2007-11 | 22.70 |
| 2007-10 | 30.30 |
| 2007-09 | 21.40 |
| 2007-08 | 36.80 |
| 2007-07 | 27.50 |
| 2007-06 | 36.70 |
| 2007-05 | 32.00 |
| 2007-04 | 37.10 |
| 2007-03 | 21.80 |
| 2007-02 | 15.60 |
| 2007-01 | 44.02 |
| 2006-12 | 17.50 |
| 2006-11 | 40.20 |
| 2006-10 | 36.40 |
| 2006-09 | 37.10 |
| 2006-08 | 12.60 |
| 2006-07 | 12.80 |
| 2006-06 | 9.70 |
| 2006-05 | 12.70 |
| 2006-04 | 19.70 |
| 2006-03 | 6.40 |
| 2006-02 | 9.00 |
| 2006-01 | -5.98 |
| 2005-12 | -4.20 |
| 2005-11 | -4.60 |
| 2005-10 | -11.80 |
| 2005-09 | -14.20 |
| 2005-08 | 5.30 |
| 2005-07 | -1.40 |
| 2005-06 | 4.50 |
| 2005-05 | 11.20 |
| 2005-04 | -12.00 |
| 2005-03 | -3.90 |
| 2005-02 | -9.70 |
| 2005-01 | 39.60 |
| 2004-12 | 22.20 |
| 2004-11 | 27.20 |
| 2004-10 | 50.70 |
| 2004-09 | 39.00 |
| 2004-08 | 30.50 |
| 2004-07 | 11.50 |
| 2004-06 | 9.40 |
| 2004-05 | 25.50 |
| 2004-04 | 37.00 |
| 2004-03 | 44.40 |
| 2004-02 | 13.50 |
| 2004-01 | -5.50 |
| 2003-12 | 35.93 |
| 2003-11 | 8.57 |
| 2003-10 | -13.63 |
| 2003-09 | 9.96 |
| 2003-08 | 50.35 |
| 2003-07 | 18.64 |
| 2003-06 | 25.81 |
| 2003-05 | -0.39 |
| 2003-04 | 2.98 |
| 2003-03 | 22.35 |
| 2003-02 | 51.98 |
| 2003-01 | 31.80 |
| 2002-12 | 47.45 |
| 2002-11 | 38.46 |
| 2002-10 | 44.64 |
| 2002-09 | 40.63 |
| 2002-08 | 42.94 |
| 2002-07 | 62.43 |
| 2002-06 | 50.87 |
| 2002-05 | 37.30 |
| 2002-04 | 25.10 |
| 2002-03 | 19.45 |
| 2002-02 | 11.55 |
| 2002-01 | 34.47 |
| 2001-12 | 27.86 |
| 2001-11 | 26.62 |
| 2001-10 | 29.60 |
| 2001-09 | 0.52 |
| 2001-08 | -2.68 |
| 2001-07 | -12.41 |
| 2001-06 | -9.18 |
| 2001-05 | 9.08 |
| 2001-04 | 10.20 |
| 2001-03 | 5.70 |
| 2001-02 | 43.30 |
| 2001-01 | -10.90 |
| 2000-12 | 9.20 |
| 2000-11 | -15.70 |
| 2000-10 | -13.30 |
| 2000-09 | 4.80 |
| 2000-08 | 3.10 |
| 2000-07 | 5.20 |
| 2000-06 | -0.10 |
| 2000-05 | 8.80 |
| 2000-04 | 6.90 |
| 2000-03 | 23.50 |
| 2000-02 | 61.30 |
| 2000-01 | -13.10 |
| 1999-12 | -24.34 |
| 1999-11 | -17.06 |
| 1999-10 | 2.89 |
| 1999-09 | 22.67 |
| 1999-08 | 26.47 |
| 1999-07 | 14.84 |
| 1999-06 | 19.36 |
| 1999-05 | 8.15 |
| 1999-04 | 5.10 |
| 1999-03 | -1.78 |
| 1999-02 | 5.87 |
| 1999-01 | 35.80 |
| 1998-12 | 18.00 |
| 1998-11 | 9.30 |
| 1998-10 | 5.90 |
| 1998-09 | 10.30 |
| 1998-08 | 6.00 |
| 1998-07 | -11.80 |
| 1998-06 | -7.70 |
| 1998-05 | 1.70 |
| 1998-04 | -1.70 |
| 1998-03 | -5.80 |
| 1998-02 | -11.10 |
| 1998-01 | -20.20 |
| 1997-12 | 9.70 |
| 1997-11 | -3.60 |
| 1997-10 | -6.40 |
| 1997-09 | 3.90 |
| 1997-08 | 3.50 |
| 1997-07 | -7.80 |
| 1997-06 | -0.01 |
| 1997-05 | -35.40 |
| 1997-04 | -2.30 |
| 1997-03 | -12.00 |
| 1997-02 | -2.50 |
| 1997-01 | -3.00 |
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