| 年月 | 单位：千美元 |
| 2007-12 | 42012.00 |
| 2007-11 | 38442.00 |
| 2007-10 | 29789.00 |
| 2007-09 | 33503.00 |
| 2007-08 | 30933.00 |
| 2007-07 | 38992.00 |
| 2007-06 | 36090.00 |
| 2007-05 | 33612.00 |
| 2007-04 | 35445.00 |
| 2007-03 | 23307.00 |
| 2007-02 | 34047.00 |
| 2007-01 | 27724.00 |
| 2006-12 | 36830.00 |
| 2006-11 | 33776.00 |
| 2006-10 | 30813.00 |
| 2006-09 | 36928.00 |
| 2006-08 | 45996.00 |
| 2006-07 | 39540.00 |
| 2006-06 | 41143.00 |
| 2006-05 | 41806.00 |
| 2006-04 | 45709.00 |
| 2006-03 | 40721.00 |
| 2006-02 | 20399.00 |
| 2006-01 | 28241.00 |
| 2005-12 | 32914.00 |
| 2005-11 | 30197.00 |
| 2005-10 | 28682.00 |
| 2005-09 | 39970.00 |
| 2005-08 | 39747.00 |
| 2005-07 | 34305.00 |
| 2005-06 | 35336.00 |
| 2005-05 | 34378.00 |
| 2005-04 | 30985.00 |
| 2005-03 | 32658.00 |
| 2005-02 | 17345.00 |
| 2005-01 | 24050.00 |
| 2004-12 | 19894.00 |
| 2004-11 | 24665.00 |
| 2004-10 | 18279.00 |
| 2004-09 | 18985.00 |
| 2004-08 | 19328.00 |
| 2004-07 | 23951.00 |
| 2004-06 | 24074.00 |
| 2004-05 | 18873.00 |
| 2004-04 | 24246.00 |
| 2004-03 | 27774.00 |
| 2004-02 | 15265.00 |
| 2004-01 | 23095.00 |
| 2003-12 | 27943.00 |
| 2003-11 | 22937.00 |
| 2003-10 | 18533.00 |
| 2003-09 | 19471.00 |
| 2003-08 | 18567.00 |
| 2003-07 | 21760.00 |
| 2003-06 | 17304.00 |
| 2003-05 | 18210.00 |
| 2003-04 | 20669.00 |
| 2003-03 | 19757.00 |
| 2003-02 | 12792.00 |
| 2003-01 | 16590.00 |
| 2002-12 | 23899.00 |
| 2002-11 | 19747.00 |
| 2002-10 | 16536.00 |
| 2002-09 | 16798.00 |
| 2002-08 | 15811.00 |
| 2002-07 | 16988.00 |
| 2002-06 | 14905.00 |
| 2002-05 | 18351.00 |
| 2002-04 | 19445.00 |
| 2002-03 | 19898.00 |
| 2002-02 | 12999.00 |
| 2002-01 | 17183.00 |
| 2001-12 | 15812.00 |
| 2001-11 | 18783.00 |
| 2001-10 | 13145.00 |
| 2001-09 | 15253.00 |
| 2001-08 | 15670.00 |
| 2001-07 | 15190.00 |
| 2001-06 | 14623.00 |
| 2001-05 | 17047.00 |
| 2001-04 | 18462.00 |
| 2001-03 | 23674.00 |
| 2001-02 | 17039.00 |
| 2001-01 | 15630.00 |
| 2000-12 | 19057.00 |
| 2000-11 | 18818.00 |
| 2000-10 | 18811.00 |
| 2000-09 | 21138.00 |
| 2000-08 | 21192.00 |
| 2000-07 | 17841.00 |
| 2000-06 | 21983.00 |
| 2000-05 | 20445.00 |
| 2000-04 | 26709.00 |
| 2000-03 | 24773.00 |
| 2000-02 | 15494.00 |
| 2000-01 | 16055.00 |
| 1999-12 | 19342.00 |
| 1999-11 | 22322.00 |
| 1999-10 | 18812.00 |
| 1999-09 | 18517.00 |
| 1999-08 | 18889.00 |
| 1999-07 | 22651.00 |
| 1999-06 | 15859.00 |
| 1999-05 | 19665.00 |
| 1999-04 | 20926.00 |
| 1999-03 | 22878.00 |
| 1999-02 | 14559.00 |
| 1999-01 | 11708.00 |
| 1998-12 | 24843.00 |
| 1998-11 | 21764.00 |
| 1998-10 | 19864.00 |
| 1998-09 | 23807.00 |
| 1998-08 | 24546.00 |
| 1998-07 | 24500.00 |
| 1998-06 | 25777.00 |
| 1998-05 | 26422.00 |
| 1998-04 | 30237.00 |
| 1998-03 | 27390.00 |
| 1998-02 | 20396.00 |
| 1998-01 | 15296.00 |
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