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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $244,036,277 | 15,757,180 | 11,728,835 |
| 2006 | $257,734,002 | 16,412,052 | 12,297,349 |
| 2007 | $303,001,969 | 20,545,301 | 12,782,603 |
| 2008 | $333,965,509 | 20,211,847 | 13,358,733 |
| 2009 | $323,934,515 | 17,546,758 | 12,992,529 |
| 2010 | $358,620,775 | 21,074,533 | 14,519,957 |
| 2011 | $392,974,138 | 21,952,647 | 14,282,395 |
Note: Quantity represents Number of pairs
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