2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $100,000,000 $200,000,000 $300,000,000 $400,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $343,912,473 | 30,194,247 | 23,651,445 |
| 2006 | $317,302,892 | 14,595,921 | 21,878,106 |
| 2007 | $361,270,173 | 0 | 25,247,381 |
| 2008 | $259,650,533 | 0 | 0 |
| 2009 | $192,821,510 | 0 | 13,048,945 |
| 2010 | $212,830,500 | 5,220,597 | 13,320,665 |
| 2011 | $219,739,382 | 0 | 12,030,604 |
Note: Quantity represents Number of pairs
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