| 年月 | 单位：千美元 |
| 2006-12 | 1368.00 |
| 2006-11 | 1205.00 |
| 2006-10 | 1157.00 |
| 2006-09 | 1157.00 |
| 2006-08 | 1096.00 |
| 2006-07 | 1073.00 |
| 2006-06 | 1073.00 |
| 2006-05 | 969.00 |
| 2006-04 | 815.00 |
| 2006-03 | 611.00 |
| 2006-02 | 383.00 |
| 2006-01 | 158.00 |
| 2005-12 | 2040.00 |
| 2005-11 | 1876.00 |
| 2005-10 | 1797.00 |
| 2005-09 | 1733.00 |
| 2005-08 | 1716.00 |
| 2005-07 | 1716.00 |
| 2005-06 | 1569.00 |
| 2005-05 | 1501.00 |
| 2005-04 | 1307.00 |
| 2005-03 | 770.00 |
| 2005-02 | 488.00 |
| 2005-01 | 283.00 |
| 2004-12 | 1959.00 |
| 2004-11 | 1898.00 |
| 2004-10 | 1801.00 |
| 2004-09 | 1638.00 |
| 2004-08 | 1638.00 |
| 2004-07 | 1617.00 |
| 2004-06 | 1591.00 |
| 2004-05 | 1591.00 |
| 2004-04 | 1333.00 |
| 2004-03 | 974.00 |
| 2004-02 | 616.00 |
| 2004-01 | 276.00 |
| 2003-12 | 2887.00 |
| 2003-11 | 2870.00 |
| 2003-10 | 2639.00 |
| 2003-09 | 2531.00 |
| 2003-08 | 2518.00 |
| 2003-07 | 2504.00 |
| 2003-06 | 2426.00 |
| 2003-05 | 2203.00 |
| 2003-04 | 1963.00 |
| 2003-03 | 1581.00 |
| 2003-02 | 974.00 |
| 2003-01 | 102.00 |
| 2002-12 | 3174.00 |
| 2002-11 | 2969.00 |
| 2002-10 | 2817.00 |
| 2002-09 | 2903.00 |
| 2002-08 | 2891.00 |
| 2002-07 | 2859.00 |
| 2002-06 | 2804.00 |
| 2002-05 | 2752.00 |
| 2002-04 | 2644.00 |
| 2002-03 | 1395.00 |
| 2002-02 | 1089.00 |
| 2002-01 | 126.00 |
| 2001-12 | 5553.00 |
| 2001-11 | 5231.00 |
| 2001-10 | 4794.00 |
| 2001-09 | 4637.00 |
| 2001-08 | 4604.00 |
| 2001-07 | 4508.00 |
| 2001-06 | 4366.00 |
| 2001-05 | 4146.00 |
| 2001-04 | 3597.00 |
| 2001-03 | 2634.00 |
| 2001-02 | 783.00 |
| 2001-01 | 390.00 |
| 2000-12 | 7937.00 |
| 2000-11 | 7744.00 |
| 2000-10 | 7468.00 |
| 2000-09 | 7209.00 |
| 2000-08 | 7175.00 |
| 2000-07 | 7089.00 |
| 2000-06 | 6881.00 |
| 2000-05 | 6532.00 |
| 2000-04 | 5092.00 |
| 2000-03 | 3856.00 |
| 2000-02 | 2003.00 |
| 2000-01 | 168.00 |
| 1999-12 | 8007.00 |
| 1999-11 | 7010.00 |
| 1999-10 | 6062.00 |
| 1999-09 | 5925.00 |
| 1999-08 | 5845.00 |
| 1999-07 | 5708.00 |
| 1999-06 | 5431.00 |
| 1999-05 | 4850.00 |
| 1999-04 | 4120.00 |
| 1999-03 | 3069.00 |
| 1999-02 | 1531.00 |
| 1999-01 | 447.00 |
| 1998-12 | 12459.00 |
| 1998-11 | 11163.00 |
| 1998-10 | 10807.00 |
| 1998-09 | 10539.00 |
| 1998-08 | 10458.00 |
| 1998-07 | 10182.00 |
| 1998-06 | 9779.00 |
| 1998-05 | 8625.00 |
| 1998-04 | 7644.00 |
| 1998-03 | 5433.00 |
| 1998-02 | 2931.00 |
| 1998-01 | 1371.00 |
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