| 年月 | 单位：千美元 |
| 2007-12 | 30274.00 |
| 2007-11 | 27829.00 |
| 2007-10 | 23010.00 |
| 2007-09 | 19631.00 |
| 2007-08 | 15237.00 |
| 2007-07 | 12621.00 |
| 2007-06 | 9865.00 |
| 2007-05 | 6787.00 |
| 2007-04 | 5067.00 |
| 2007-03 | 3401.00 |
| 2007-02 | 2157.00 |
| 2007-01 | 1338.00 |
| 2006-12 | 23888.00 |
| 2006-11 | 21082.00 |
| 2006-10 | 19530.00 |
| 2006-09 | 18032.00 |
| 2006-08 | 15115.00 |
| 2006-07 | 12799.00 |
| 2006-06 | 10377.00 |
| 2006-05 | 7085.00 |
| 2006-04 | 4979.00 |
| 2006-03 | 2931.00 |
| 2006-02 | 2364.00 |
| 2006-01 | 1601.00 |
| 2005-12 | 32928.00 |
| 2005-11 | 30665.00 |
| 2005-10 | 28220.00 |
| 2005-09 | 24955.00 |
| 2005-08 | 23116.00 |
| 2005-07 | 19501.00 |
| 2005-06 | 17019.00 |
| 2005-05 | 12614.00 |
| 2005-04 | 9536.00 |
| 2005-03 | 5219.00 |
| 2005-02 | 2563.00 |
| 2005-01 | 1649.00 |
| 2004-12 | 22573.00 |
| 2004-11 | 19393.00 |
| 2004-10 | 16710.00 |
| 2004-09 | 15183.00 |
| 2004-08 | 12817.00 |
| 2004-07 | 9664.00 |
| 2004-06 | 7783.00 |
| 2004-05 | 5786.00 |
| 2004-04 | 4229.00 |
| 2004-03 | 3419.00 |
| 2004-02 | 2135.00 |
| 2004-01 | 751.00 |
| 2003-12 | 11740.00 |
| 2003-11 | 10617.00 |
| 2003-10 | 8886.00 |
| 2003-09 | 7606.00 |
| 2003-08 | 6554.00 |
| 2003-07 | 4999.00 |
| 2003-06 | 4410.00 |
| 2003-05 | 3591.00 |
| 2003-04 | 2573.00 |
| 2003-03 | 1789.00 |
| 2003-02 | 1073.00 |
| 2003-01 | 518.00 |
| 2002-12 | 13208.00 |
| 2002-11 | 11767.00 |
| 2002-10 | 10807.00 |
| 2002-09 | 10270.00 |
| 2002-08 | 9630.00 |
| 2002-07 | 8815.00 |
| 2002-06 | 7923.00 |
| 2002-05 | 5384.00 |
| 2002-04 | 4216.00 |
| 2002-03 | 3248.00 |
| 2002-02 | 1972.00 |
| 2002-01 | 1198.00 |
| 2001-12 | 15660.00 |
| 2001-11 | 14111.00 |
| 2001-10 | 13186.00 |
| 2001-09 | 11750.00 |
| 2001-08 | 10351.00 |
| 2001-07 | 9160.00 |
| 2001-06 | 8122.00 |
| 2001-05 | 6492.00 |
| 2001-04 | 5162.00 |
| 2001-03 | 4102.00 |
| 2001-02 | 3303.00 |
| 2001-01 | 679.00 |
| 2000-12 | 25208.00 |
| 2000-11 | 22119.00 |
| 2000-10 | 19082.00 |
| 2000-09 | 17165.00 |
| 2000-08 | 15831.00 |
| 2000-07 | 12244.00 |
| 2000-06 | 10022.00 |
| 2000-05 | 8762.00 |
| 2000-04 | 7833.00 |
| 2000-03 | 5362.00 |
| 2000-02 | 2428.00 |
| 2000-01 | 623.00 |
| 1999-12 | 21191.00 |
| 1999-11 | 20355.00 |
| 1999-10 | 19613.00 |
| 1999-09 | 18563.00 |
| 1999-08 | 15160.00 |
| 1999-07 | 14382.00 |
| 1999-06 | 12800.00 |
| 1999-05 | 11805.00 |
| 1999-04 | 9001.00 |
| 1999-03 | 7891.00 |
| 1999-02 | 5949.00 |
| 1999-01 | 5285.00 |
| 1998-12 | 42025.00 |
| 1998-11 | 37666.00 |
| 1998-10 | 33841.00 |
| 1998-09 | 28224.00 |
| 1998-08 | 27292.00 |
| 1998-07 | 24841.00 |
| 1998-06 | 22365.00 |
| 1998-05 | 19086.00 |
| 1998-04 | 13473.00 |
| 1998-03 | 10202.00 |
| 1998-02 | 5564.00 |
| 1998-01 | 4102.00 |
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