| 年月 | 单位：千美元 |
| 2007-12 | 6953.00 |
| 2007-11 | 6890.00 |
| 2007-10 | 6737.00 |
| 2007-09 | 6689.00 |
| 2007-08 | 6610.00 |
| 2007-07 | 4913.00 |
| 2007-06 | 4821.00 |
| 2007-05 | 4740.00 |
| 2007-04 | 3765.00 |
| 2007-03 | 2933.00 |
| 2007-02 | 122.00 |
| 2007-01 | 92.00 |
| 2006-12 | 21181.00 |
| 2006-11 | 21134.00 |
| 2006-10 | 18370.00 |
| 2006-09 | 14976.00 |
| 2006-08 | 10517.00 |
| 2006-07 | 7733.00 |
| 2006-06 | 4775.00 |
| 2006-05 | 4710.00 |
| 2006-04 | 4623.00 |
| 2006-03 | 4544.00 |
| 2006-02 | 2731.00 |
| 2006-01 | 2685.00 |
| 2005-12 | 12761.00 |
| 2005-11 | 7844.00 |
| 2005-10 | 6822.00 |
| 2005-09 | 6768.00 |
| 2005-08 | 6706.00 |
| 2005-07 | 5305.00 |
| 2005-06 | 5252.00 |
| 2005-05 | 5201.00 |
| 2005-04 | 5125.00 |
| 2005-03 | 219.00 |
| 2005-02 | 102.00 |
| 2005-01 | 52.00 |
| 2004-12 | 22746.00 |
| 2004-11 | 20394.00 |
| 2004-10 | 18045.00 |
| 2004-09 | 14357.00 |
| 2004-08 | 14289.00 |
| 2004-07 | 13232.00 |
| 2004-06 | 13176.00 |
| 2004-05 | 11034.00 |
| 2004-04 | 8507.00 |
| 2004-03 | 5284.00 |
| 2004-02 | 3553.00 |
| 2004-01 | 996.00 |
| 2003-12 | 31405.00 |
| 2003-11 | 26993.00 |
| 2003-10 | 25161.00 |
| 2003-09 | 23646.00 |
| 2003-08 | 22642.00 |
| 2003-07 | 18583.00 |
| 2003-06 | 15687.00 |
| 2003-05 | 14557.00 |
| 2003-04 | 11580.00 |
| 2003-03 | 8637.00 |
| 2003-02 | 5559.00 |
| 2003-01 | 2678.00 |
| 2002-12 | 30293.00 |
| 2002-11 | 27211.00 |
| 2002-10 | 23280.00 |
| 2002-09 | 20517.00 |
| 2002-08 | 17495.00 |
| 2002-07 | 10704.00 |
| 2002-06 | 8859.00 |
| 2002-05 | 5777.00 |
| 2002-04 | 4798.00 |
| 2002-03 | 4745.00 |
| 2002-02 | 1465.00 |
| 2002-01 | 766.00 |
| 2001-12 | 7887.00 |
| 2001-11 | 7203.00 |
| 2001-10 | 7166.00 |
| 2001-09 | 6048.00 |
| 2001-08 | 6003.00 |
| 2001-07 | 5430.00 |
| 2001-06 | 5375.00 |
| 2001-05 | 4690.00 |
| 2001-04 | 4645.00 |
| 2001-03 | 4051.00 |
| 2001-02 | 2628.00 |
| 2001-01 | 1089.00 |
| 2000-12 | 14600.00 |
| 2000-11 | 11681.00 |
| 2000-10 | 8417.00 |
| 2000-09 | 8381.00 |
| 2000-08 | 5824.00 |
| 2000-07 | 4161.00 |
| 2000-06 | 4114.00 |
| 2000-05 | 3749.00 |
| 2000-04 | 2560.00 |
| 2000-03 | 2504.00 |
| 2000-02 | 2041.00 |
| 2000-01 | 1563.00 |
| 1999-12 | 4904.00 |
| 1999-11 | 4770.00 |
| 1999-10 | 4670.00 |
| 1999-09 | 4550.00 |
| 1999-08 | 3624.00 |
| 1999-07 | 3496.00 |
| 1999-06 | 2863.00 |
| 1999-05 | 2289.00 |
| 1999-04 | 2178.00 |
| 1999-03 | 1551.00 |
| 1999-02 | 1444.00 |
| 1999-01 | 728.00 |
| 1998-12 | 12932.00 |
| 1998-11 | 11051.00 |
| 1998-10 | 10351.00 |
| 1998-09 | 9657.00 |
| 1998-08 | 9324.00 |
| 1998-07 | 7762.00 |
| 1998-06 | 6043.00 |
| 1998-05 | 4458.00 |
| 1998-04 | 4050.00 |
| 1998-03 | 3319.00 |
| 1998-02 | 2984.00 |
| 1998-01 | 1150.00 |
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