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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $186,284,136 | 7,128,339 | 9,160,388 |
| 2006 | $231,740,294 | 8,124,162 | 10,600,527 |
| 2007 | $248,473,780 | 9,565,344 | 9,465,520 |
| 2008 | $223,383,319 | 7,052,990 | 8,061,959 |
| 2009 | $201,094,609 | 6,274,977 | 6,805,190 |
| 2010 | $200,494,633 | 6,227,137 | 7,220,269 |
| 2011 | $236,355,036 | 6,049,414 | 6,992,305 |
Note: Quantity represents Number of pairs
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