| 年月 | 单位：千美元 |
| 2007-12 | 64.00 |
| 2007-11 | 153.00 |
| 2007-10 | 47.00 |
| 2007-09 | 79.00 |
| 2007-08 | 1697.00 |
| 2007-07 | 92.00 |
| 2007-06 | 82.00 |
| 2007-05 | 974.00 |
| 2007-04 | 833.00 |
| 2007-03 | 2810.00 |
| 2007-02 | 31.00 |
| 2007-01 | 92.00 |
| 2006-12 | 47.00 |
| 2006-11 | 2764.00 |
| 2006-10 | 3394.00 |
| 2006-09 | 4459.00 |
| 2006-08 | 2784.00 |
| 2006-07 | 2959.00 |
| 2006-06 | 65.00 |
| 2006-05 | 87.00 |
| 2006-04 | 78.00 |
| 2006-03 | 1813.00 |
| 2006-02 | 46.00 |
| 2006-01 | 2685.00 |
| 2005-12 | 4917.00 |
| 2005-11 | 1021.00 |
| 2005-10 | 55.00 |
| 2005-09 | 61.00 |
| 2005-08 | 1402.00 |
| 2005-07 | 53.00 |
| 2005-06 | 53.00 |
| 2005-05 | 76.00 |
| 2005-04 | 4905.00 |
| 2005-03 | 118.00 |
| 2005-02 | 50.00 |
| 2005-01 | 52.00 |
| 2004-12 | 2352.00 |
| 2004-11 | 2348.00 |
| 2004-10 | 3688.00 |
| 2004-09 | 68.00 |
| 2004-08 | 1057.00 |
| 2004-07 | 56.00 |
| 2004-06 | 2143.00 |
| 2004-05 | 2526.00 |
| 2004-04 | 3223.00 |
| 2004-03 | 1731.00 |
| 2004-02 | 2557.00 |
| 2004-01 | 996.00 |
| 2003-12 | 4412.00 |
| 2003-11 | 1832.00 |
| 2003-10 | 1514.00 |
| 2003-09 | 1004.00 |
| 2003-08 | 4059.00 |
| 2003-07 | 2896.00 |
| 2003-06 | 1130.00 |
| 2003-05 | 2977.00 |
| 2003-04 | 2943.00 |
| 2003-03 | 3077.00 |
| 2003-02 | 2881.00 |
| 2003-01 | 2678.00 |
| 2002-12 | 3083.00 |
| 2002-11 | 3931.00 |
| 2002-10 | 2763.00 |
| 2002-09 | 3023.00 |
| 2002-08 | 6791.00 |
| 2002-07 | 1845.00 |
| 2002-06 | 3082.00 |
| 2002-05 | 979.00 |
| 2002-04 | 53.00 |
| 2002-03 | 3280.00 |
| 2002-02 | 699.00 |
| 2002-01 | 766.00 |
| 2001-12 | 684.00 |
| 2001-11 | 38.00 |
| 2001-10 | 1118.00 |
| 2001-09 | 45.00 |
| 2001-08 | 572.00 |
| 2001-07 | 55.00 |
| 2001-06 | 685.00 |
| 2001-05 | 45.00 |
| 2001-04 | 593.00 |
| 2001-03 | 1423.00 |
| 2001-02 | 1539.00 |
| 2001-01 | 1089.00 |
| 2000-12 | 2919.00 |
| 2000-11 | 3264.00 |
| 2000-10 | 36.00 |
| 2000-09 | 2557.00 |
| 2000-08 | 1663.00 |
| 2000-07 | 47.00 |
| 2000-06 | 366.00 |
| 2000-05 | 1188.00 |
| 2000-04 | 56.00 |
| 2000-03 | 463.00 |
| 2000-02 | 478.00 |
| 2000-01 | 1563.00 |
| 1999-12 | 134.00 |
| 1999-11 | 100.00 |
| 1999-10 | 120.00 |
| 1999-09 | 926.00 |
| 1999-08 | 128.00 |
| 1999-07 | 633.00 |
| 1999-06 | 574.00 |
| 1999-05 | 111.00 |
| 1999-04 | 627.00 |
| 1999-03 | 107.00 |
| 1999-02 | 716.00 |
| 1999-01 | 728.00 |
| 1998-12 | 1881.00 |
| 1998-11 | 699.00 |
| 1998-10 | 695.00 |
| 1998-09 | 333.00 |
| 1998-08 | 1562.00 |
| 1998-07 | 1719.00 |
| 1998-06 | 1585.00 |
| 1998-05 | 408.00 |
| 1998-04 | 731.00 |
| 1998-03 | 335.00 |
| 1998-02 | 1834.00 |
| 1998-01 | 1150.00 |
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