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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $488,736,593 | 136,923,989 | 136,923,989 |
| 2006 | $672,744,048 | 163,742,007 | 163,742,007 |
| 2007 | $611,913,557 | 137,781,608 | 137,781,608 |
| 2008 | $559,827,121 | 122,598,882 | 122,598,882 |
| 2009 | $357,447,694 | 105,419,141 | 105,419,141 |
| 2010 | $397,767,106 | 97,992,065 | 97,992,065 |
| 2011 | $348,697,667 | 73,979,505 | 73,979,505 |
Note: Quantity represents Weight in kilograms
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