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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $660,911,557 | 4,385,028,856 | 4,385,028,856 |
| 2006 | $1,205,806,243 | 6,334,144,752 | 6,334,144,752 |
| 2007 | $1,824,814,154 | 7,528,499,656 | 7,528,499,656 |
| 2008 | $3,005,989,553 | 8,102,025,404 | 8,102,025,404 |
| 2009 | $2,521,999,288 | 9,670,994,552 | 9,670,994,552 |
| 2010 | $2,557,537,143 | 8,734,401,592 | 8,734,401,592 |
| 2011 | $6,009,937,436 | 12,802,856,232 | 12,802,856,232 |
Note: Quantity represents Weight in kilograms
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