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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $619,387,964 | 21,651,830,487 | 21,651,830,487 |
| 2006 | $1,270,238,206 | 44,763,255,463 | 44,763,255,463 |
| 2007 | $1,497,240,618 | 49,243,336,549 | 49,243,336,549 |
| 2008 | $2,873,012,867 | 64,836,175,218 | 64,836,175,218 |
| 2009 | $4,213,992,941 | 76,920,296,621 | 76,920,296,621 |
| 2010 | $6,154,787,128 | 111,423,436,749 | 111,423,436,749 |
| 2011 | $10,270,962,585 | 151,455,502,104 | 151,455,502,104 |
Note: Quantity represents Weight in kilograms
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