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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,059,192,003 | 4,308,224,698 | 4,308,224,698 |
| 2006 | $1,036,815,490 | 4,207,541,023 | 4,207,541,023 |
| 2007 | $1,329,155,168 | 4,046,653,097 | 4,046,653,097 |
| 2008 | $1,924,563,775 | 3,933,243,155 | 3,933,243,155 |
| 2009 | $1,236,650,014 | 2,052,579,596 | 2,052,579,596 |
| 2010 | $1,516,015,434 | 3,447,414,665 | 3,447,414,665 |
Note: Quantity represents Weight in kilograms
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