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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $55,176,000 | 4,401,975 | 6,051,122 |
| 2006 | $65,758,000 | 4,022,174 | 7,211,644 |
| 2007 | $91,647,000 | 5,321,619 | 6,949,531 |
| 2008 | $121,364,000 | 6,099,904 | 7,314,821 |
| 2009 | $166,653,000 | 8,014,181 | 7,940,732 |
| 2010 | $205,918,183 | 10,016,658 | 10,051,893 |
| 2011 | $338,580,372 | 14,105,799 | 19,520,254 |
Note: Quantity represents Number of pairs
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