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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $7,285,322,963 | 6,596,148,088 | 6,596,148,088 |
| 2006 | $12,380,580,556 | 6,463,424,528 | 6,463,424,528 |
| 2007 | $14,236,679,508 | 6,872,046,744 | 6,872,046,744 |
| 2008 | $10,617,967,547 | 6,667,522,212 | 6,667,522,212 |
| 2009 | $9,413,673,619 | 6,017,494,169 | 6,017,494,169 |
| 2010 | $13,685,084,296 | 1,740,490,383 | 1,740,490,383 |
| 2011 | $14,304,495,195 | 1,774,763,037 | 1,774,763,037 |
Note: Quantity represents Weight in kilograms
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