| 年月 | 单位：千美元 |
| 2006-12 | 163.00 |
| 2006-11 | 48.00 |
| 2006-09 | 61.00 |
| 2006-08 | 23.00 |
| 2006-07 | 0.00 |
| 2006-06 | 104.00 |
| 2006-05 | 154.00 |
| 2006-04 | 204.00 |
| 2006-03 | 227.00 |
| 2006-02 | 225.00 |
| 2006-01 | 158.00 |
| 2005-12 | 164.00 |
| 2005-11 | 79.00 |
| 2005-10 | 64.00 |
| 2005-09 | 16.00 |
| 2005-08 | 0.00 |
| 2005-07 | 147.00 |
| 2005-06 | 69.00 |
| 2005-05 | 194.00 |
| 2005-04 | 536.00 |
| 2005-03 | 282.00 |
| 2005-02 | 205.00 |
| 2005-01 | 283.00 |
| 2004-12 | 61.00 |
| 2004-11 | 97.00 |
| 2004-10 | 163.00 |
| 2004-09 | 0.00 |
| 2004-08 | 22.00 |
| 2004-07 | 26.00 |
| 2004-06 | 0.00 |
| 2004-05 | 258.00 |
| 2004-04 | 359.00 |
| 2004-03 | 358.00 |
| 2004-02 | 340.00 |
| 2004-01 | 276.00 |
| 2003-12 | 17.00 |
| 2003-11 | 231.00 |
| 2003-10 | 108.00 |
| 2003-09 | 13.00 |
| 2003-08 | 14.00 |
| 2003-07 | 78.00 |
| 2003-06 | 223.00 |
| 2003-05 | 240.00 |
| 2003-04 | 383.00 |
| 2003-03 | 606.00 |
| 2003-02 | 873.00 |
| 2003-01 | 102.00 |
| 2002-12 | 205.00 |
| 2002-11 | 152.00 |
| 2002-10 | 78.00 |
| 2002-09 | 12.00 |
| 2002-08 | 32.00 |
| 2002-07 | 55.00 |
| 2002-06 | 52.00 |
| 2002-05 | 108.00 |
| 2002-04 | 1249.00 |
| 2002-03 | 306.00 |
| 2002-02 | 963.00 |
| 2002-01 | 126.00 |
| 2001-12 | 322.00 |
| 2001-11 | 437.00 |
| 2001-10 | 158.00 |
| 2001-09 | 33.00 |
| 2001-08 | 96.00 |
| 2001-07 | 142.00 |
| 2001-06 | 219.00 |
| 2001-05 | 549.00 |
| 2001-04 | 963.00 |
| 2001-03 | 1850.00 |
| 2001-02 | 393.00 |
| 2001-01 | 390.00 |
| 2000-12 | 193.00 |
| 2000-11 | 276.00 |
| 2000-10 | 259.00 |
| 2000-09 | 33.00 |
| 2000-08 | 87.00 |
| 2000-07 | 208.00 |
| 2000-06 | 349.00 |
| 2000-05 | 1440.00 |
| 2000-04 | 1236.00 |
| 2000-03 | 1853.00 |
| 2000-02 | 1835.00 |
| 2000-01 | 168.00 |
| 1999-12 | 997.00 |
| 1999-11 | 947.00 |
| 1999-10 | 137.00 |
| 1999-09 | 81.00 |
| 1999-08 | 136.00 |
| 1999-07 | 277.00 |
| 1999-06 | 581.00 |
| 1999-05 | 730.00 |
| 1999-04 | 1051.00 |
| 1999-03 | 1538.00 |
| 1999-02 | 1084.00 |
| 1999-01 | 447.00 |
| 1998-12 | 1295.00 |
| 1998-11 | 356.00 |
| 1998-10 | 218.00 |
| 1998-09 | 132.00 |
| 1998-08 | 275.00 |
| 1998-07 | 486.00 |
| 1998-06 | 1122.00 |
| 1998-05 | 980.00 |
| 1998-04 | 2211.00 |
| 1998-03 | 2502.00 |
| 1998-02 | 1560.00 |
| 1998-01 | 1371.00 |
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