| 年月 | 单位：% |
| 2008-12 | 23.30 |
| 2008-11 | 23.80 |
| 2008-10 | 26.70 |
| 2008-09 | 25.40 |
| 2008-08 | 31.60 |
| 2008-07 | 31.50 |
| 2008-06 | 27.10 |
| 2008-05 | 23.70 |
| 2008-04 | 22.40 |
| 2008-03 | 18.70 |
| 2008-02 | 18.10 |
| 2008-01 | 20.77 |
| 2007-12 | 14.10 |
| 2007-11 | 15.00 |
| 2007-10 | 14.00 |
| 2007-09 | 11.80 |
| 2007-08 | 10.20 |
| 2007-07 | 9.20 |
| 2007-06 | 8.40 |
| 2007-05 | 3.80 |
| 2007-04 | 3.70 |
| 2007-03 | 2.70 |
| 2007-02 | -2.40 |
| 2007-01 | -0.29 |
| 2006-12 | 30.60 |
| 2006-11 | 33.00 |
| 2006-10 | 39.40 |
| 2006-09 | 41.60 |
| 2006-08 | 45.20 |
| 2006-07 | 51.40 |
| 2006-06 | 51.30 |
| 2006-05 | 59.40 |
| 2006-04 | 63.40 |
| 2006-03 | 74.80 |
| 2006-02 | 62.20 |
| 2006-01 | 58.83 |
| 2005-12 | 24.30 |
| 2005-11 | 23.40 |
| 2005-10 | 21.20 |
| 2005-09 | 17.50 |
| 2005-08 | 15.70 |
| 2005-07 | 14.30 |
| 2005-06 | 15.70 |
| 2005-05 | 12.70 |
| 2005-04 | 10.20 |
| 2005-03 | 3.50 |
| 2005-02 | 18.80 |
| 2005-01 | 30.10 |
| 2004-12 | 47.70 |
| 2004-11 | 53.70 |
| 2004-10 | 54.20 |
| 2004-09 | 57.70 |
| 2004-08 | 59.00 |
| 2004-07 | 58.80 |
| 2004-06 | 41.90 |
| 2004-05 | 39.70 |
| 2004-04 | 39.20 |
| 2004-03 | 38.30 |
| 2004-02 | 33.20 |
| 2004-01 | 25.60 |
| 2003-12 | 29.42 |
| 2003-11 | 27.98 |
| 2003-10 | 25.77 |
| 2003-09 | 23.42 |
| 2003-08 | 22.89 |
| 2003-07 | 22.23 |
| 2003-06 | 24.24 |
| 2003-05 | 26.65 |
| 2003-04 | 28.42 |
| 2003-03 | 30.36 |
| 2003-02 | 44.17 |
| 2003-01 | 78.39 |
| 2002-12 | 37.14 |
| 2002-11 | 36.97 |
| 2002-10 | 37.62 |
| 2002-09 | 37.00 |
| 2002-08 | 39.32 |
| 2002-07 | 35.80 |
| 2002-06 | 33.08 |
| 2002-05 | 31.58 |
| 2002-04 | 22.52 |
| 2002-03 | 14.29 |
| 2002-02 | 4.35 |
| 2002-01 | -1.04 |
| 2001-12 | -0.91 |
| 2001-11 | -2.93 |
| 2001-10 | -4.11 |
| 2001-09 | -4.91 |
| 2001-08 | -5.87 |
| 2001-07 | -3.16 |
| 2001-06 | 4.73 |
| 2001-05 | 0.83 |
| 2001-04 | 25.50 |
| 2001-03 | 23.80 |
| 2001-02 | 21.20 |
| 2001-01 | -21.50 |
| 2000-12 | 29.60 |
| 2000-11 | 30.50 |
| 2000-10 | 33.60 |
| 2000-09 | 37.70 |
| 2000-08 | 38.90 |
| 2000-07 | 40.30 |
| 2000-06 | 42.50 |
| 2000-05 | 48.30 |
| 2000-04 | 61.40 |
| 2000-03 | 63.80 |
| 2000-02 | 58.00 |
| 1999-12 | 149.03 |
| 1999-11 | 124.98 |
| 1999-10 | 114.71 |
| 1999-09 | 108.32 |
| 1999-08 | 108.99 |
| 1999-07 | 99.85 |
| 1999-06 | 84.42 |
| 1999-05 | 60.24 |
| 1999-04 | 44.78 |
| 1999-03 | -2.43 |
| 1999-02 | 31.07 |
| 1999-01 | 69.35 |
| 1998-12 | 18.80 |
| 1998-11 | 25.50 |
| 1998-10 | 36.10 |
| 1998-09 | 41.60 |
| 1998-08 | 40.90 |
| 1998-07 | 54.70 |
| 1998-06 | 58.80 |
| 1998-05 | 77.30 |
| 1998-04 | 93.90 |
| 1998-03 | 109.30 |
| 1998-02 | 93.30 |
| 1998-01 | 0.90 |
| 1997-12 | 21.90 |
| 1997-11 | 34.70 |
| 1997-10 | 32.30 |
| 1997-09 | 32.50 |
| 1997-08 | 40.20 |
| 1997-07 | 45.80 |
| 1997-06 | 60.70 |
| 1997-05 | 17.10 |
| 1997-04 | 24.10 |
| 1997-03 | 16.30 |
| 1997-02 | 25.20 |
| 1997-01 | -15.70 |
| 1995-12 | 31.93 |
| 1995-11 | 38.19 |
| 1995-10 | 39.14 |
| 1995-09 | 43.07 |
| 1995-08 | 49.68 |
| 1995-07 | 58.86 |
| 1995-06 | 64.71 |
| 1995-05 | 72.38 |
| 1995-04 | 90.02 |
| 1995-03 | 72.24 |
| 1995-02 | 56.31 |
| 1995-01 | 106.89 |
| 1993-12 | 56.50 |
| 1993-11 | 52.90 |
| 1993-10 | 45.30 |
| 1993-09 | 47.00 |
| 1993-08 | 35.00 |
| 1993-07 | 20.90 |
| 1993-06 | 14.60 |
| 1993-05 | 0.80 |
| 1993-04 | -6.70 |
| 1993-03 | 1.10 |
| 1993-02 | -15.30 |
| 1993-01 | -7.30 |
| 1992-12 | -8.60 |
| 1992-11 | -7.00 |
| 1992-10 | -0.50 |
| 1992-09 | 4.80 |
| 1992-08 | 12.20 |
| 1992-07 | 21.70 |
| 1992-06 | 25.90 |
| 1992-05 | 40.30 |
| 1992-04 | 62.50 |
| 1992-03 | 54.00 |
| 1992-02 | 49.20 |
| 1992-01 | 3.20 |
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