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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $4,373,008 | 4,076,224 | 233,567 |
| 2006 | $4,090,010 | 4,109,512 | 4,183,312 |
| 2007 | $2,331,327 | 86,482 | 128,441 |
| 2008 | $2,809,419 | 102,734 | 2,574,273 |
| 2009 | $2,168,458 | 1,958,420 | 1,778,481 |
| 2010 | $2,588,312 | 2,058,723 | 1,862,255 |
| 2011 | $2,656,971 | 1,638,585 | 1,387,647 |
Note: Quantity represents Number of pairs
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