| 年月 | 单位：% |
| 2008-12 | -1.10 |
| 2008-11 | 3.70 |
| 2008-10 | 7.20 |
| 2008-09 | 13.70 |
| 2008-08 | 14.40 |
| 2008-07 | 20.40 |
| 2008-06 | 20.70 |
| 2008-05 | 21.20 |
| 2008-04 | 19.90 |
| 2008-03 | 26.30 |
| 2008-02 | 26.20 |
| 2008-01 | 20.72 |
| 2007-12 | 26.90 |
| 2007-11 | 26.30 |
| 2007-10 | 26.50 |
| 2007-09 | 30.30 |
| 2007-08 | 27.00 |
| 2007-07 | 26.10 |
| 2007-06 | 34.40 |
| 2007-05 | 31.30 |
| 2007-04 | 31.20 |
| 2007-03 | 27.70 |
| 2007-02 | 29.30 |
| 2007-01 | 44.02 |
| 2006-12 | 19.60 |
| 2006-11 | 20.00 |
| 2006-10 | 18.10 |
| 2006-09 | 16.50 |
| 2006-08 | 13.90 |
| 2006-07 | 10.80 |
| 2006-06 | 8.80 |
| 2006-05 | 8.40 |
| 2006-04 | 7.40 |
| 2006-03 | 3.30 |
| 2006-02 | 1.00 |
| 2006-01 | -5.98 |
| 2005-12 | -5.30 |
| 2005-11 | -5.50 |
| 2005-10 | -5.50 |
| 2005-09 | -1.60 |
| 2005-08 | -17.90 |
| 2005-07 | 0.70 |
| 2005-06 | 1.10 |
| 2005-05 | 0.80 |
| 2005-04 | -1.10 |
| 2005-03 | 4.90 |
| 2005-02 | 12.10 |
| 2005-01 | 39.60 |
| 2004-12 | 25.10 |
| 2004-11 | 24.80 |
| 2004-10 | 24.60 |
| 2004-09 | 21.90 |
| 2004-08 | 21.20 |
| 2004-07 | 19.90 |
| 2004-06 | 20.90 |
| 2004-05 | 22.70 |
| 2004-04 | 22.20 |
| 2004-03 | 17.10 |
| 2004-02 | 2.10 |
| 2004-01 | -5.50 |
| 2003-12 | 17.09 |
| 2003-11 | 15.58 |
| 2003-10 | 14.48 |
| 2003-09 | 18.42 |
| 2003-08 | 21.43 |
| 2003-07 | 17.97 |
| 2003-06 | 17.91 |
| 2003-05 | 18.17 |
| 2003-04 | 24.47 |
| 2003-03 | 34.59 |
| 2003-02 | 41.65 |
| 2003-01 | 31.80 |
| 2002-12 | 38.33 |
| 2002-11 | 36.95 |
| 2002-10 | 36.85 |
| 2002-09 | 35.91 |
| 2002-08 | 35.26 |
| 2002-07 | 34.49 |
| 2002-06 | 32.52 |
| 2002-05 | 29.75 |
| 2002-04 | 23.49 |
| 2002-03 | 22.85 |
| 2002-02 | 25.61 |
| 2002-01 | 34.47 |
| 2001-12 | 8.93 |
| 2001-11 | 7.69 |
| 2001-10 | 6.10 |
| 2001-09 | 4.17 |
| 2001-08 | 4.57 |
| 2001-07 | 5.59 |
| 2001-06 | 7.92 |
| 2001-05 | 11.98 |
| 2001-04 | 10.10 |
| 2001-03 | 8.80 |
| 2001-02 | 11.80 |
| 2001-01 | -10.90 |
| 2000-12 | 2.70 |
| 2000-11 | 1.30 |
| 2000-10 | 3.10 |
| 2000-09 | 5.00 |
| 2000-08 | 5.00 |
| 2000-07 | 5.30 |
| 2000-06 | 5.30 |
| 2000-05 | 6.30 |
| 2000-04 | 8.40 |
| 2000-03 | 9.00 |
| 2000-02 | 21.60 |
| 2000-01 | -13.10 |
| 1999-12 | 6.20 |
| 1999-11 | 8.60 |
| 1999-10 | 11.70 |
| 1999-09 | 14.00 |
| 1999-08 | 12.60 |
| 1999-07 | 10.80 |
| 1999-06 | 10.20 |
| 1999-05 | 8.60 |
| 1999-04 | 8.00 |
| 1999-03 | 9.30 |
| 1999-02 | 21.60 |
| 1999-01 | 35.80 |
| 1998-12 | 0.60 |
| 1998-11 | 0.30 |
| 1998-10 | -1.10 |
| 1998-09 | -1.90 |
| 1998-08 | -3.50 |
| 1998-07 | -5.10 |
| 1998-06 | -4.20 |
| 1998-05 | -3.60 |
| 1998-04 | -5.10 |
| 1998-03 | -7.70 |
| 1998-02 | -17.40 |
| 1998-01 | -20.20 |
| 1997-12 | -1.90 |
| 1997-11 | -2.80 |
| 1997-10 | -2.50 |
| 1997-09 | -2.30 |
| 1997-08 | -2.90 |
| 1997-07 | -3.90 |
| 1997-06 | -10.40 |
| 1997-05 | -16.00 |
| 1997-04 | -7.70 |
| 1997-03 | -5.80 |
| 1997-02 | -4.60 |
| 1997-01 | -3.00 |
| 1996-12 | 1.04 |
| 1996-11 | 1.31 |
| 1996-10 | 0.94 |
| 1996-09 | 0.26 |
| 1996-08 | -0.63 |
| 1996-07 | 1.15 |
| 1996-06 | 3.54 |
| 1996-05 | 5.57 |
| 1996-04 | 6.70 |
| 1996-03 | 13.25 |
| 1996-02 | 10.95 |
| 1996-01 | 27.83 |
| 1995-12 | 22.18 |
| 1995-11 | 23.05 |
| 1995-10 | 24.65 |
| 1995-09 | 25.46 |
| 1995-08 | 26.90 |
| 1995-07 | 29.29 |
| 1995-06 | 31.30 |
| 1995-05 | 33.61 |
| 1995-04 | 50.24 |
| 1995-03 | 44.20 |
| 1995-02 | 39.36 |
| 1995-01 | 20.45 |
| 1994-12 | 15.31 |
| 1994-11 | 13.39 |
| 1994-10 | 12.61 |
| 1994-09 | 9.38 |
| 1994-08 | 6.78 |
| 1994-07 | 3.50 |
| 1994-06 | 2.69 |
| 1994-05 | 1.45 |
| 1994-04 | -11.42 |
| 1994-03 | -12.76 |
| 1994-02 | -8.24 |
| 1994-01 | 13.40 |
| 1993-12 | 16.00 |
| 1993-11 | 16.10 |
| 1993-10 | 17.00 |
| 1993-09 | 21.20 |
| 1993-08 | 25.40 |
| 1993-07 | 29.60 |
| 1993-06 | 33.10 |
| 1993-05 | 29.80 |
| 1993-04 | 31.50 |
| 1993-03 | 33.50 |
| 1993-02 | 43.40 |
| 1993-01 | 34.30 |
| 1992-12 | 31.00 |
| 1992-11 | 30.60 |
| 1992-10 | 30.30 |
| 1992-09 | 29.20 |
| 1992-08 | 28.60 |
| 1992-07 | 29.80 |
| 1992-06 | 28.80 |
| 1992-05 | 35.50 |
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