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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $447,650,213 | 25,055,193 | 27,967,721 |
| 2006 | $487,393,378 | 24,685,139 | 28,883,809 |
| 2007 | $587,105,354 | 24,976,276 | 30,580,037 |
| 2008 | $569,004,987 | 19,682,871 | 25,437,079 |
| 2009 | $385,230,666 | 14,108,176 | 18,124,027 |
| 2010 | $364,101,308 | 12,642,638 | 17,291,664 |
| 2011 | $439,185,039 | 14,197,054 | 18,916,999 |
Note: Quantity represents Number of pairs
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