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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $272,548,154 | 6,148,492 | 10,240,677 |
| 2006 | $304,036,515 | 6,692,672 | 11,169,796 |
| 2007 | $338,525,333 | 7,048,275 | 11,036,507 |
| 2008 | $327,970,672 | 4,697,525 | 8,783,828 |
| 2009 | $266,042,638 | 3,255,998 | 7,524,893 |
| 2010 | $303,423,150 | 7,680,863 | 9,125,470 |
| 2011 | $352,087,852 | 7,619,307 | 5,626,299 |
Note: Quantity represents Number of pairs
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