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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $2,051,360,089 | 3,595,722,968 | 3,595,722,968 |
| 2006 | $2,304,567,040 | 3,918,569,976 | 3,918,569,976 |
| 2007 | $2,796,260,829 | 4,259,208,000 | 4,259,208,000 |
| 2008 | $3,198,129,300 | 4,727,420,395 | 4,727,420,395 |
| 2009 | $2,596,479,486 | 4,429,732,976 | 4,429,732,976 |
| 2010 | $3,482,631,970 | 5,060,857,008 | 5,060,857,008 |
| 2011 | $3,943,455,858 | 5,680,266,016 | 5,680,266,016 |
Note: Quantity represents Weight in kilograms
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