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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $3,015,509,615 | 3,019,175,024 | 3,019,175,024 |
| 2006 | $3,316,014,428 | 2,944,820,705 | 2,944,820,705 |
| 2007 | $3,862,106,973 | 3,069,601,937 | 3,069,601,937 |
| 2008 | $4,012,281,384 | 2,788,752,083 | 2,788,752,083 |
| 2009 | $4,558,446,402 | 4,159,544,347 | 4,159,544,347 |
| 2010 | $5,177,285,801 | 3,870,461,164 | 3,870,461,164 |
| 2011 | $5,877,843,156 | 3,780,227,215 | 3,780,227,215 |
Note: Quantity represents Weight in kilograms
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