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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $343,688,000 | 9,370,609 | 19,066,211 |
| 2006 | $401,371,000 | 10,051,180 | 22,266,196 |
| 2007 | $458,723,000 | 9,383,411 | 14,691,023 |
| 2008 | $518,700,000 | 9,189,373 | 12,327,901 |
| 2009 | $460,316,000 | 8,615,880 | 9,885,531 |
| 2010 | $550,939,261 | 10,454,978 | 12,014,885 |
| 2011 | $867,032,838 | 16,819,578 | 19,773,492 |
Note: Quantity represents Number of pairs
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