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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,417,749,456 | 2,941,110,268 | 2,941,110,268 |
| 2006 | $1,439,232,002 | 3,257,219,218 | 3,257,219,218 |
| 2007 | $2,264,241,292 | 4,391,111,354 | 4,391,111,354 |
| 2008 | $3,261,776,414 | 4,173,395,419 | 4,173,395,419 |
| 2009 | $2,023,064,963 | 4,356,312,030 | 4,356,312,030 |
| 2010 | $2,742,603,928 | 4,823,775,169 | 4,823,775,169 |
| 2011 | $2,326,392,408 | 3,338,131,251 | 3,338,131,251 |
Note: Quantity represents Weight in kilograms
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