| 年月 | 单位：% |
| 2008-12 | 10.30 |
| 2008-11 | -3.20 |
| 2008-10 | 36.90 |
| 2008-09 | -13.90 |
| 2008-08 | 32.10 |
| 2008-07 | 52.80 |
| 2008-06 | 42.80 |
| 2008-05 | 34.60 |
| 2008-04 | 30.00 |
| 2008-03 | 9.70 |
| 2008-02 | 15.50 |
| 2008-01 | 20.77 |
| 2007-12 | 12.70 |
| 2007-11 | 26.20 |
| 2007-10 | 31.80 |
| 2007-09 | 22.60 |
| 2007-08 | 17.20 |
| 2007-07 | 13.10 |
| 2007-06 | 28.60 |
| 2007-05 | 6.90 |
| 2007-04 | 19.20 |
| 2007-03 | 10.90 |
| 2007-02 | -4.80 |
| 2007-01 | -0.29 |
| 2006-12 | 11.30 |
| 2006-11 | 18.80 |
| 2006-10 | 23.60 |
| 2006-09 | 20.00 |
| 2006-08 | 37.10 |
| 2006-07 | 52.70 |
| 2006-06 | 26.60 |
| 2006-05 | 42.50 |
| 2006-04 | 38.90 |
| 2006-03 | 58.50 |
| 2006-02 | 65.60 |
| 2006-01 | 58.83 |
| 2005-12 | 32.40 |
| 2005-11 | 44.80 |
| 2005-10 | 50.60 |
| 2005-09 | 35.50 |
| 2005-08 | 25.10 |
| 2005-07 | 7.20 |
| 2005-06 | 22.20 |
| 2005-05 | 22.20 |
| 2005-04 | 24.70 |
| 2005-03 | 2.40 |
| 2005-02 | 8.90 |
| 2005-01 | 30.10 |
| 2004-12 | 5.30 |
| 2004-11 | 22.30 |
| 2004-10 | 31.50 |
| 2004-09 | 37.30 |
| 2004-08 | 60.20 |
| 2004-07 | 70.20 |
| 2004-06 | 49.80 |
| 2004-05 | 41.50 |
| 2004-04 | 41.60 |
| 2004-03 | 43.30 |
| 2004-02 | 40.80 |
| 2004-01 | 25.60 |
| 2003-12 | 39.07 |
| 2003-11 | 48.03 |
| 2003-10 | 44.21 |
| 2003-09 | 31.40 |
| 2003-08 | 27.96 |
| 2003-07 | 14.59 |
| 2003-06 | 15.42 |
| 2003-05 | 20.20 |
| 2003-04 | 20.36 |
| 2003-03 | 13.91 |
| 2003-02 | 31.87 |
| 2003-01 | 78.39 |
| 2002-12 | 38.60 |
| 2002-11 | 31.11 |
| 2002-10 | 36.27 |
| 2002-09 | 23.20 |
| 2002-08 | 48.32 |
| 2002-07 | 54.01 |
| 2002-06 | 38.83 |
| 2002-05 | 62.63 |
| 2002-04 | 49.03 |
| 2002-03 | 29.28 |
| 2002-02 | 9.60 |
| 2002-01 | -1.04 |
| 2001-12 | 17.98 |
| 2001-11 | 8.62 |
| 2001-10 | 2.93 |
| 2001-09 | 0.84 |
| 2001-08 | -21.56 |
| 2001-07 | -35.26 |
| 2001-06 | 21.14 |
| 2001-05 | -14.87 |
| 2001-04 | 30.70 |
| 2001-03 | 20.90 |
| 2001-02 | 30.10 |
| 2001-01 | -21.50 |
| 2000-12 | 29.10 |
| 2000-11 | 5.70 |
| 2000-10 | -0.70 |
| 2000-09 | 30.90 |
| 2000-08 | 32.30 |
| 2000-07 | 30.60 |
| 2000-06 | 13.00 |
| 2000-05 | 17.50 |
| 2000-04 | 55.70 |
| 2000-03 | 59.60 |
| 2000-02 | 36.30 |
| 1999-12 | 347.57 |
| 1999-11 | 229.03 |
| 1999-10 | 268.18 |
| 1999-09 | 104.76 |
| 1999-08 | 166.41 |
| 1999-07 | 179.87 |
| 1999-06 | 263.36 |
| 1999-05 | 119.22 |
| 1999-04 | 104.96 |
| 1999-03 | -38.59 |
| 1999-02 | -2.56 |
| 1999-01 | 69.35 |
| 1998-12 | -30.60 |
| 1998-11 | -31.30 |
| 1998-10 | -4.90 |
| 1998-09 | 44.70 |
| 1998-08 | -9.50 |
| 1998-07 | 36.40 |
| 1998-06 | -9.70 |
| 1998-05 | 31.30 |
| 1998-04 | 64.10 |
| 1998-03 | 130.90 |
| 1998-02 | 120.60 |
| 1998-01 | 0.90 |
| 1997-12 | 24.30 |
| 1997-11 | 59.20 |
| 1997-10 | 13.50 |
| 1997-09 | 4.60 |
| 1997-08 | 8.90 |
| 1997-07 | -9.90 |
| 1997-06 | 109.10 |
| 1997-05 | -6.40 |
| 1997-04 | 60.10 |
| 1997-03 | 9.70 |
| 1997-02 | 1.40 |
| 1997-01 | -15.70 |
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