| 年月 | 单位：% |
| 2009-12 | 5.34 |
| 2009-11 | 4.24 |
| 2009-10 | 3.36 |
| 2009-09 | 2.50 |
| 2009-08 | 1.80 |
| 2009-07 | 1.60 |
| 2009-06 | 3.00 |
| 2009-05 | 2.70 |
| 2009-04 | 1.10 |
| 2009-03 | -1.20 |
| 2009-02 | -0.30 |
| 2009-01 | -0.50 |
| 2008-12 | 10.70 |
| 2008-11 | 11.30 |
| 2008-10 | 12.50 |
| 2008-09 | 13.70 |
| 2008-08 | 14.20 |
| 2008-07 | 9.80 |
| 2008-06 | 8.20 |
| 2008-05 | 10.70 |
| 2008-04 | 10.40 |
| 2008-03 | 10.90 |
| 2008-02 | 12.30 |
| 2008-01 | 7.60 |
| 2007-12 | 25.60 |
| 2007-11 | 28.70 |
| 2007-10 | 29.20 |
| 2007-09 | 30.50 |
| 2007-08 | 30.90 |
| 2007-07 | 32.50 |
| 2007-06 | 34.29 |
| 2007-05 | 30.20 |
| 2007-04 | 26.26 |
| 2007-03 | 19.87 |
| 2007-02 | 16.44 |
| 2007-01 | 22.44 |
| 2006-12 | 4.60 |
| 2006-11 | 5.00 |
| 2006-10 | 5.00 |
| 2006-09 | 5.00 |
| 2006-08 | 5.70 |
| 2006-07 | 5.40 |
| 2006-06 | 6.60 |
| 2006-05 | 7.70 |
| 2006-04 | 7.90 |
| 2006-03 | 11.30 |
| 2006-02 | 17.80 |
| 2006-01 | 19.90 |
| 2005-12 | 16.80 |
| 2005-11 | 18.70 |
| 2005-10 | 17.60 |
| 2005-09 | 16.70 |
| 2005-08 | 14.10 |
| 2005-07 | 11.70 |
| 2005-06 | 9.70 |
| 2005-05 | -0.60 |
| 2005-04 | -2.70 |
| 2005-03 | -1.00 |
| 2005-02 | -6.70 |
| 2005-01 | -6.90 |
| 2004-12 | 21.60 |
| 2004-11 | 22.50 |
| 2004-10 | 23.70 |
| 2004-09 | 26.60 |
| 2004-08 | 30.30 |
| 2004-07 | 34.10 |
| 2004-06 | 40.40 |
| 2004-05 | 49.40 |
| 2004-04 | 49.10 |
| 2004-03 | 49.90 |
| 2004-02 | 52.30 |
| 2004-01 | 45.40 |
| 2003-12 | 62.10 |
| 2003-11 | 63.70 |
| 2003-10 | 67.00 |
| 2003-09 | 70.10 |
| 2003-08 | 73.90 |
| 2003-07 | 77.80 |
| 2003-06 | 86.90 |
| 2003-05 | 75.70 |
| 2003-04 | 82.00 |
| 2003-03 | 86.80 |
| 2003-02 | 83.80 |
| 2003-01 | 97.68 |
| 2002-12 | 65.10 |
| 2002-11 | 63.00 |
| 2002-10 | 58.40 |
| 2002-09 | 52.60 |
| 2002-08 | 44.90 |
| 2002-07 | 40.90 |
| 2002-06 | 36.00 |
| 2002-05 | 30.20 |
| 2002-04 | 23.10 |
| 2002-03 | 17.90 |
| 2002-02 | 21.70 |
| 2002-01 | 20.90 |
| 2001-12 | 10.30 |
| 2001-11 | 11.30 |
| 2001-10 | 13.50 |
| 2001-09 | 15.40 |
| 2001-08 | 17.30 |
| 2001-07 | 18.90 |
| 2001-06 | 122.10 |
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