| 年月 | 单位：% |
| 2008-12 | -19.20 |
| 2008-11 | -18.30 |
| 2008-10 | -21.60 |
| 2008-09 | -25.30 |
| 2008-08 | -29.60 |
| 2008-07 | -15.70 |
| 2008-06 | -12.70 |
| 2008-05 | -14.90 |
| 2008-04 | -4.10 |
| 2008-03 | -19.80 |
| 2008-02 | -28.70 |
| 2008-01 | -29.12 |
| 2007-12 | 4.10 |
| 2007-11 | 6.40 |
| 2007-10 | 44.70 |
| 2007-09 | 45.50 |
| 2007-08 | 36.20 |
| 2007-07 | 32.40 |
| 2007-06 | 30.40 |
| 2007-05 | 28.20 |
| 2007-04 | 5.10 |
| 2007-03 | 6.30 |
| 2007-02 | -18.00 |
| 2007-01 | -13.17 |
| 2006-12 | 1.00 |
| 2006-11 | -4.20 |
| 2006-10 | -4.60 |
| 2006-09 | -5.20 |
| 2006-08 | -5.80 |
| 2006-07 | -7.60 |
| 2006-06 | -13.50 |
| 2006-05 | -23.10 |
| 2006-04 | -34.31 |
| 2006-03 | -46.20 |
| 2006-02 | -49.20 |
| 2006-01 | -51.99 |
| 2005-12 | -42.10 |
| 2005-11 | -40.60 |
| 2005-10 | -41.80 |
| 2005-09 | -42.80 |
| 2005-08 | -43.00 |
| 2005-07 | -41.30 |
| 2005-06 | -40.10 |
| 2005-05 | -35.70 |
| 2005-04 | -33.60 |
| 2005-03 | -20.00 |
| 2005-02 | -9.90 |
| 2005-01 | 51.90 |
| 2004-12 | 3.70 |
| 2004-11 | 7.10 |
| 2004-10 | 11.60 |
| 2004-09 | 15.10 |
| 2004-08 | 33.70 |
| 2004-07 | 39.50 |
| 2004-06 | 41.80 |
| 2004-05 | 47.30 |
| 2004-04 | 51.20 |
| 2004-03 | 30.20 |
| 2004-02 | 54.80 |
| 2004-01 | 9.70 |
| 2003-12 | 8.46 |
| 2003-11 | 5.71 |
| 2003-10 | 6.36 |
| 2003-09 | 6.71 |
| 2003-08 | 9.99 |
| 2003-07 | 12.76 |
| 2003-06 | 12.51 |
| 2003-05 | 15.20 |
| 2003-04 | 24.03 |
| 2003-03 | 47.61 |
| 2003-02 | 126.42 |
| 2003-01 | 63.23 |
| 2002-12 | 32.82 |
| 2002-11 | 33.04 |
| 2002-10 | 29.81 |
| 2002-09 | 25.77 |
| 2002-08 | 21.75 |
| 2002-07 | 17.59 |
| 2002-06 | 22.39 |
| 2002-05 | 24.94 |
| 2002-04 | 16.27 |
| 2002-03 | -17.24 |
| 2002-02 | -14.13 |
| 2002-01 | -13.79 |
| 2001-12 | 7.75 |
| 2001-11 | 8.99 |
| 2001-10 | 10.40 |
| 2001-09 | 9.08 |
| 2001-08 | 11.12 |
| 2001-07 | 13.33 |
| 2001-06 | 23.29 |
| 2001-05 | 25.01 |
| 2001-04 | 22.80 |
| 2001-03 | 16.30 |
| 2001-02 | 30.50 |
| 2001-01 | 84.00 |
| 2000-12 | 11.60 |
| 2000-11 | 12.50 |
| 2000-10 | 14.60 |
| 2000-09 | 15.90 |
| 2000-08 | 16.10 |
| 2000-07 | 15.20 |
| 2000-06 | 12.90 |
| 2000-05 | 14.90 |
| 2000-04 | 14.90 |
| 1999-12 | 63.92 |
| 1999-11 | 60.24 |
| 1999-10 | 56.15 |
| 1999-09 | 51.81 |
| 1999-08 | 43.24 |
| 1999-07 | 40.49 |
| 1999-06 | 32.76 |
| 1999-05 | 12.80 |
| 1999-04 | 9.25 |
| 1999-03 | 5.49 |
| 1999-02 | 6.39 |
| 1999-01 | 19.23 |
| 1998-06 | 37.40 |
| 1998-05 | 38.20 |
| 1998-04 | 41.00 |
| 1998-03 | 37.30 |
| 1998-02 | 31.30 |
| 1998-01 | 3.80 |
| 1997-12 | -0.70 |
| 1997-11 | 2.10 |
| 1997-10 | 1.00 |
| 1997-09 | 0.10 |
| 1997-08 | -2.20 |
| 1997-07 | -1.50 |
| 1997-06 | 1.80 |
| 1997-05 | 27.40 |
| 1997-04 | 2.00 |
| 1997-03 | -1.40 |
| 1997-02 | 3.40 |
| 1997-01 | 6.00 |
| 1995-12 | -13.78 |
| 1995-11 | -20.27 |
| 1995-10 | -21.81 |
| 1995-09 | -23.50 |
| 1995-08 | -29.27 |
| 1995-07 | -27.33 |
| 1995-06 | -21.74 |
| 1995-05 | -16.19 |
| 1995-04 | -9.92 |
| 1995-03 | -14.10 |
| 1995-02 | -12.52 |
| 1995-01 | 45.32 |
| 1993-12 | 88.10 |
| 1993-11 | 61.50 |
| 1993-10 | 61.40 |
| 1993-09 | 59.00 |
| 1993-08 | 58.80 |
| 1993-07 | 66.70 |
| 1993-06 | 66.70 |
| 1993-05 | 56.50 |
| 1993-04 | 47.40 |
| 1993-03 | 20.00 |
| 1993-02 | 30.00 |
| 1993-01 | 19.30 |
| 1992-12 | 168.20 |
| 1992-11 | 173.70 |
| 1992-10 | 193.30 |
| 1992-09 | 225.00 |
| 1992-08 | 277.80 |
| 1992-07 | 328.60 |
| 1992-06 | 440.00 |
| 1992-05 | 475.00 |
| 1992-04 | 533.30 |
| 1992-03 | 650.00 |
| 1992-02 | 6.80 |
| 1992-01 | 3.80 |
| 1991-12 | 4.70 |
| 1991-11 | 4.50 |
| 1991-10 | 406.40 |
| 1991-09 | 3.00 |
| 1991-08 | 2.20 |
| 1991-07 | 1.40 |
| 1991-06 | 85.50 |
| 1991-05 | 36.90 |
| 1991-04 | 4.80 |
| 1991-03 | -17.00 |
| 1991-02 | -10.80 |
| 1991-01 | 2.00 |
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