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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $14,913,505 | 1,130,086 | 2,661,225 |
| 2006 | $17,597,192 | 1,174,435 | 2,008,046 |
| 2007 | $27,403,381 | 1,694,655 | 2,788,180 |
| 2008 | $31,025,916 | 1,756,735 | 3,015,826 |
| 2009 | $26,602,622 | 1,399,454 | 2,516,708 |
| 2010 | $33,537,145 | 1,884,485 | 3,331,517 |
| 2011 | $40,715,949 | 2,012,651 | 3,465,066 |
Note: Quantity represents Number of pairs
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