| 年月 | 单位：% |
| 2010-12 | 26.60 |
| 2010-11 | 32.90 |
| 2010-10 | 37.76 |
| 2010-09 | 39.20 |
| 2010-08 | 39.90 |
| 2010-07 | 40.80 |
| 2010-06 | 40.20 |
| 2010-05 | 56.31 |
| 2010-04 | 49.50 |
| 2010-03 | 41.90 |
| 2010-02 | 37.12 |
| 2010-01 | 54.02 |
| 2009-12 | 18.60 |
| 2009-11 | 16.20 |
| 2009-10 | 11.80 |
| 2009-09 | 8.92 |
| 2009-08 | 7.90 |
| 2009-07 | 5.58 |
| 2009-06 | 3.47 |
| 2009-05 | -0.60 |
| 2009-04 | 2.40 |
| 2009-03 | -9.50 |
| 2009-02 | -20.10 |
| 2009-01 | -26.64 |
| 2008-12 | 30.80 |
| 2008-11 | 34.70 |
| 2008-10 | 41.50 |
| 2008-09 | 41.60 |
| 2008-08 | 44.50 |
| 2008-07 | 49.00 |
| 2008-06 | 52.60 |
| 2008-05 | 53.20 |
| 2008-04 | 60.90 |
| 2008-03 | 71.60 |
| 2008-02 | 81.90 |
| 2008-01 | 87.90 |
| 2007-12 | 26.10 |
| 2007-11 | 24.30 |
| 2007-10 | 21.90 |
| 2007-09 | 20.70 |
| 2007-08 | 19.50 |
| 2007-07 | 20.40 |
| 2007-06 | 18.90 |
| 2007-05 | 16.60 |
| 2007-04 | 12.70 |
| 2007-03 | 12.50 |
| 2007-02 | 13.40 |
| 2007-01 | 14.98 |
| 2006-12 | 21.40 |
| 2006-11 | 20.80 |
| 2006-10 | 21.70 |
| 2006-09 | 21.40 |
| 2006-08 | 22.50 |
| 2006-07 | 21.10 |
| 2006-06 | 21.00 |
| 2006-05 | 20.70 |
| 2006-04 | 20.70 |
| 2006-03 | 20.10 |
| 2006-02 | 21.00 |
| 2006-01 | 21.23 |
| 2005-12 | 23.70 |
| 2005-11 | 18.90 |
| 2005-10 | 18.50 |
| 2005-09 | 16.10 |
| 2005-08 | 15.90 |
| 2005-07 | 17.20 |
| 2005-06 | 17.80 |
| 2005-05 | 15.70 |
| 2005-04 | 17.30 |
| 2005-03 | 22.40 |
| 2005-02 | 15.90 |
| 2005-01 | 25.10 |
| 2004-12 | 7.70 |
| 2004-11 | 8.20 |
| 2004-10 | 16.40 |
| 2004-09 | 17.30 |
| 2004-08 | 17.50 |
| 2004-07 | 14.10 |
| 2004-06 | 14.70 |
| 2004-05 | 15.00 |
| 2004-04 | 14.70 |
| 2004-03 | 16.10 |
| 2004-02 | 20.00 |
| 2004-01 | 14.80 |
| 2003-12 | 35.07 |
| 2003-11 | 35.55 |
| 2003-10 | 25.07 |
| 2003-09 | 26.14 |
| 2003-08 | 26.09 |
| 2003-07 | 25.92 |
| 2003-06 | 24.18 |
| 2003-05 | 23.04 |
| 2003-04 | 23.31 |
| 2003-03 | 17.44 |
| 2003-02 | 13.14 |
| 2003-01 | 11.63 |
| 2002-12 | 13.36 |
| 2002-11 | 13.18 |
| 2002-10 | 11.06 |
| 2002-09 | 14.65 |
| 2002-08 | 16.54 |
| 2002-07 | 15.04 |
| 2002-06 | 13.83 |
| 2002-05 | 14.32 |
| 2002-04 | 12.74 |
| 2002-03 | 13.28 |
| 2002-02 | 18.19 |
| 2002-01 | 18.02 |
| 2001-12 | 9.75 |
| 2001-11 | 9.65 |
| 2001-10 | 10.45 |
| 2001-09 | 12.57 |
| 2001-08 | 14.16 |
| 2001-07 | 17.30 |
| 2001-06 | 19.12 |
| 2001-05 | 16.81 |
| 2001-04 | 16.50 |
| 2001-03 | 13.70 |
| 2001-02 | 10.10 |
| 2001-01 | 26.90 |
| 2000-12 | 12.00 |
| 2000-11 | 10.20 |
| 2000-10 | 9.10 |
| 2000-09 | 8.70 |
| 2000-08 | 7.40 |
| 2000-07 | 6.80 |
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