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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $18,072,858 | 3,976,427 | 10,609,819 |
| 2006 | $24,254,045 | 3,266,699 | 13,461,501 |
| 2007 | $24,558,600 | 4,324,984 | 13,385,460 |
| 2008 | $32,809,187 | 4,634,167 | 14,482,179 |
| 2009 | $30,258,347 | 3,240,471 | 13,993,511 |
| 2010 | $36,443,604 | 3,891,580 | 16,902,030 |
| 2011 | $28,147,618 | 3,822,112 | 12,020,531 |
Note: Quantity represents Number of pairs
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