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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $3,140,794,411 | 13,304,557,389 | 13,304,557,389 |
| 2006 | $3,908,025,278 | 15,060,692,360 | 15,060,692,360 |
| 2007 | $5,585,808,400 | 17,097,633,716 | 17,097,633,716 |
| 2008 | $8,959,395,735 | 17,409,879,092 | 17,409,879,092 |
| 2009 | $4,237,811,019 | 15,657,074,678 | 15,657,074,678 |
| 2010 | $7,116,504,345 | 19,183,812,582 | 19,183,812,582 |
| 2011 | $9,613,152,812 | 21,124,803,048 | 21,124,803,048 |
Note: Quantity represents Weight in kilograms
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