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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $346,311,060 | 9,488,894 | 13,629,202 |
| 2006 | $369,399,183 | 10,040,187 | 14,286,094 |
| 2007 | $407,709,812 | 9,726,697 | 13,907,612 |
| 2008 | $449,058,986 | 9,227,016 | 13,059,122 |
| 2009 | $400,628,979 | 8,269,395 | 11,729,760 |
| 2010 | $412,366,672 | 8,516,872 | 11,905,936 |
| 2011 | $464,979,268 | 8,421,935 | 12,112,122 |
Note: Quantity represents Number of pairs
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