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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,580,175,150 | 4,766,481,351 | 4,766,481,351 |
| 2006 | $1,417,820,087 | 4,237,469,801 | 4,237,469,801 |
| 2007 | $2,259,722,811 | 5,808,761,020 | 5,808,761,020 |
| 2008 | $2,830,070,947 | 3,497,747,865 | 3,497,747,865 |
| 2009 | $2,380,348,868 | 2,127,185,574 | 2,127,185,574 |
| 2010 | $2,282,450,490 | 2,489,687,452 | 2,489,687,452 |
| 2011 | $3,983,310,565 | 4,758,841,459 | 4,758,841,459 |
Note: Quantity represents Weight in kilograms
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