|
| Commodity | 2006 | 2007 | 2008 | 2009 | 2010 |
| Natural barium carbonate (witherite), whether or not calcined, other than b ... | $2,000 | $5,000 | $2,000 | $4,000 | $5,000 |
| Natural barium carbonate (witherite), whether or not calcined, other than b ... | | $3,000 | | | |
| Total | $2,000 | $8,000 | $2,000 | $4,000 | $5,000 |
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