| 年月 | 单位：% |
| 2008-12 | 11.70 |
| 2008-11 | 13.40 |
| 2008-10 | 15.40 |
| 2008-09 | 16.30 |
| 2008-08 | 17.30 |
| 2008-07 | 18.10 |
| 2008-06 | 17.70 |
| 2008-05 | 18.00 |
| 2008-04 | 21.40 |
| 2008-03 | 26.70 |
| 2008-02 | 20.70 |
| 2008-01 | 37.70 |
| 2007-12 | 5.40 |
| 2007-11 | 6.10 |
| 2007-10 | 5.80 |
| 2007-09 | 5.50 |
| 2007-08 | 5.20 |
| 2007-07 | 5.50 |
| 2007-06 | 4.10 |
| 2007-05 | 5.40 |
| 2007-04 | 6.50 |
| 2007-03 | 3.90 |
| 2007-02 | 18.00 |
| 2007-01 | -4.50 |
| 2006-12 | 12.20 |
| 2006-11 | 11.60 |
| 2006-10 | 10.90 |
| 2006-09 | 10.90 |
| 2006-08 | 11.00 |
| 2006-07 | 10.80 |
| 2006-06 | 11.50 |
| 2006-05 | 11.90 |
| 2006-04 | 11.10 |
| 2006-03 | 10.70 |
| 2006-02 | 10.30 |
| 2006-01 | 22.10 |
| 2005-12 | 15.10 |
| 2005-11 | 16.70 |
| 2005-10 | 18.20 |
| 2005-09 | 19.00 |
| 2005-08 | 19.60 |
| 2005-07 | 18.50 |
| 2005-06 | 17.90 |
| 2005-05 | 18.20 |
| 2005-04 | 19.50 |
| 2005-03 | 23.20 |
| 2005-02 | 27.30 |
| 2005-01 | 24.90 |
| 2004-12 | -5.20 |
| 2004-11 | -4.40 |
| 2004-10 | -6.00 |
| 2004-09 | -6.80 |
| 2004-08 | -7.40 |
| 2004-07 | -8.80 |
| 2004-06 | -9.30 |
| 2004-05 | -11.30 |
| 2004-04 | -11.30 |
| 2004-03 | -11.10 |
| 2004-02 | -16.30 |
| 2004-01 | -16.50 |
| 2003-12 | 22.20 |
| 2003-11 | 20.80 |
| 2003-10 | 22.70 |
| 2003-09 | 24.20 |
| 2003-08 | 25.70 |
| 2003-07 | 29.40 |
| 2003-06 | 32.70 |
| 2003-05 | 34.70 |
| 2003-04 | 35.60 |
| 2003-03 | 37.80 |
| 2003-02 | 39.60 |
| 2003-01 | 47.40 |
| 2002-12 | 37.10 |
| 2002-11 | 36.10 |
| 2002-10 | 35.90 |
| 2002-09 | 33.80 |
| 2002-08 | 32.90 |
| 2002-07 | 30.00 |
| 2002-06 | 25.60 |
| 2002-05 | 23.10 |
| 2002-04 | 22.20 |
| 2002-03 | 16.80 |
| 2002-02 | 22.40 |
| 2002-01 | 50.50 |
| 2001-12 | 3.90 |
| 2001-11 | 2.20 |
| 2001-10 | 0.50 |
| 2001-09 | 0.40 |
| 2001-08 | -1.50 |
| 2001-07 | -1.40 |
| 2001-06 | -2.30 |
| 2001-05 | -0.80 |
| 2001-04 | -2.20 |
| 2001-03 | -0.60 |
| 2001-02 | -2.20 |
| 2001-01 | -20.40 |
| 2000-12 | 7.20 |
| 2000-11 | 9.00 |
| 2000-10 | 11.30 |
| 2000-09 | 12.40 |
| 2000-08 | 13.90 |
| 2000-07 | 16.10 |
| 2000-06 | 20.10 |
| 2000-05 | 18.20 |
| 2000-04 | 21.40 |
| 2000-03 | 23.30 |
| 2000-02 | 31.70 |
| 2000-01 | 40.80 |
| 1999-12 | 10.10 |
| 1999-11 | 12.00 |
| 1999-10 | 11.40 |
| 1999-09 | 10.00 |
| 1999-08 | 9.60 |
| 1999-07 | 7.50 |
| 1999-06 | 5.00 |
| 1999-05 | 6.20 |
| 1999-04 | 4.80 |
| 1999-03 | 4.70 |
| 1999-02 | 3.40 |
| 1999-01 | 12.40 |
| 1998-12 | -9.90 |
| 1998-11 | -12.50 |
| 1998-10 | -14.20 |
| 1998-09 | -14.60 |
| 1998-08 | -16.00 |
| 1998-07 | -17.10 |
| 1998-06 | -17.50 |
| 1998-05 | -17.90 |
| 1998-04 | -16.20 |
| 1998-03 | -14.60 |
| 1998-02 | -15.10 |
| 1998-01 | -19.40 |
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