| 年月 | 单位：% |
| 2007-12 | -15.40 |
| 2007-11 | -11.00 |
| 2007-10 | -10.40 |
| 2007-09 | -9.80 |
| 2007-08 | -11.30 |
| 2007-07 | -13.50 |
| 2007-06 | -11.80 |
| 2007-05 | -19.60 |
| 2007-04 | -28.90 |
| 2007-03 | -30.80 |
| 2007-02 | 3.80 |
| 2007-01 | 8.40 |
| 2006-12 | 20.70 |
| 2006-11 | 16.60 |
| 2006-10 | 18.90 |
| 2006-09 | 20.20 |
| 2006-08 | 28.00 |
| 2006-07 | 27.50 |
| 2006-06 | 24.50 |
| 2006-05 | 26.90 |
| 2006-04 | 21.80 |
| 2006-03 | 34.30 |
| 2006-02 | 0.90 |
| 2006-01 | -0.40 |
| 2005-12 | -33.00 |
| 2005-11 | -30.80 |
| 2005-10 | -27.70 |
| 2005-09 | -27.30 |
| 2005-08 | -28.00 |
| 2005-07 | -28.40 |
| 2005-06 | -26.50 |
| 2005-05 | -22.40 |
| 2005-04 | -12.80 |
| 2005-03 | -8.30 |
| 2005-02 | 25.20 |
| 2005-01 | 26.70 |
| 2004-12 | 5.50 |
| 2004-11 | 8.60 |
| 2004-10 | 5.80 |
| 2004-09 | 9.20 |
| 2004-08 | 6.50 |
| 2004-07 | 6.60 |
| 2004-06 | 12.00 |
| 2004-05 | 14.80 |
| 2004-04 | 12.80 |
| 2004-03 | 4.70 |
| 2004-02 | -30.50 |
| 2004-01 | -51.60 |
| 2003-12 | -40.40 |
| 2003-11 | -41.80 |
| 2003-10 | -40.90 |
| 2003-09 | -42.10 |
| 2003-08 | -40.40 |
| 2003-07 | -39.30 |
| 2003-06 | -41.70 |
| 2003-05 | -43.10 |
| 2003-04 | -45.70 |
| 2003-03 | -49.70 |
| 2003-02 | -38.90 |
| 2003-01 | -33.50 |
| 2002-12 | 16.10 |
| 2002-11 | 11.20 |
| 2002-10 | 4.00 |
| 2002-09 | 1.00 |
| 2002-08 | -2.20 |
| 2002-07 | -7.70 |
| 2002-06 | -9.80 |
| 2002-05 | -9.50 |
| 2002-04 | -9.70 |
| 2002-03 | -14.60 |
| 2002-02 | -3.00 |
| 2002-01 | 0.00 |
| 2001-12 | -18.50 |
| 2001-11 | -18.50 |
| 2001-10 | -18.70 |
| 2001-09 | -19.90 |
| 2001-08 | -21.10 |
| 2001-07 | -15.90 |
| 2001-06 | -9.10 |
| 2001-05 | -10.10 |
| 2001-04 | -4.20 |
| 2001-03 | 4.40 |
| 2001-02 | 12.90 |
| 2001-01 | 25.90 |
| 2000-12 | -3.80 |
| 2000-11 | -4.20 |
| 2000-10 | -1.70 |
| 2000-09 | 8.80 |
| 2000-08 | 29.10 |
| 2000-07 | 37.10 |
| 2000-06 | 46.40 |
| 2000-05 | 54.60 |
| 2000-04 | 54.40 |
| 2000-03 | 37.40 |
| 2000-02 | -2.20 |
| 2000-01 | -0.90 |
| 1999-12 | 84.70 |
| 1999-11 | 96.90 |
| 1999-10 | 95.90 |
| 1999-09 | 78.20 |
| 1999-08 | 56.40 |
| 1999-07 | 49.80 |
| 1999-06 | 35.90 |
| 1999-05 | 24.90 |
| 1999-04 | 15.50 |
| 1999-03 | 17.80 |
| 1999-02 | 56.20 |
| 1999-01 | 49.20 |
| 1998-12 | -30.30 |
| 1998-11 | -30.90 |
| 1998-10 | -31.90 |
| 1998-09 | -30.80 |
| 1998-08 | -32.50 |
| 1998-07 | -29.40 |
| 1998-06 | -27.10 |
| 1998-05 | -23.60 |
| 1998-04 | -21.70 |
| 1998-03 | -8.80 |
| 1998-02 | -23.00 |
| 1998-01 | -11.30 |
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