2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $5,000,000 $10,000,000 $15,000,000 $20,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $7,631,219 | 2,384,415 | 2,384,415 |
| 2006 | $12,846,307 | 2,470,711 | 2,470,711 |
| 2007 | $17,258,477 | 3,433,492 | 3,433,492 |
| 2008 | $15,282,596 | 2,679,600 | 2,679,600 |
| 2009 | $9,033,939 | 2,262,654 | 2,262,654 |
| 2010 | $13,304,672 | 2,852,565 | 2,852,565 |
| 2011 | $16,033,469 | 2,517,131 | 2,517,131 |
Note: Quantity represents Weight in kilograms
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