2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $2,000,000 $4,000,000 $6,000,000 $8,000,000 $10,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,374,599 | 58,982 | 421,486 |
| 2006 | $2,377,151 | 201,362 | 539,391 |
| 2007 | $2,274,116 | 161,867 | 482,875 |
| 2008 | $2,598,340 | 125,618 | 480,107 |
| 2009 | $2,879,630 | 103,038 | 471,773 |
| 2010 | $6,948,160 | 136,758 | 509,043 |
| 2011 | $7,526,577 | 143,350 | 460,913 |
Note: Quantity represents Number of pairs
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