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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $755,359,662 | 1,628,462,984 | 1,628,462,984 |
| 2006 | $889,761,487 | 1,781,836,992 | 1,781,836,992 |
| 2007 | $911,303,228 | 1,684,729,960 | 1,684,729,960 |
| 2008 | $1,027,856,140 | 1,795,778,111 | 1,795,778,111 |
| 2009 | $531,953,378 | 1,203,322,008 | 1,203,322,008 |
| 2010 | $775,220,598 | 1,174,534,016 | 1,174,534,016 |
| 2011 | $727,165,764 | 1,158,486,000 | 1,158,486,000 |
Note: Quantity represents Weight in kilograms
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