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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $165,855,000 | 16,694,805 | 14,532,117 |
| 2006 | $197,361,000 | 17,756,570 | 17,292,654 |
| 2007 | $245,832,000 | 22,227,571 | 21,183,752 |
| 2008 | $294,273,000 | 23,508,238 | 21,657,847 |
| 2009 | $399,081,000 | 29,633,017 | 26,121,471 |
| 2010 | $511,894,320 | 34,934,152 | 33,494,740 |
| 2011 | $615,864,807 | 40,446,915 | 39,203,766 |
Note: Quantity represents Number of pairs
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