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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Producer gas/water gas generators, with/without their purifiers; acetylene ... | $2,235,034 | $6,908,810 | $10,842,647 | $6,593,473 | $8,396,384 | $10,672,872 | $9,751,670 |
| Parts of the producer gas/water gas generators/acetylene gas & sim. water p ... | $489,370 | $9,676,208 | $22,925,318 | $2,528,117 | $1,458,383 | $3,642,430 | $6,298,574 |
| Total | $2,724,404 | $16,585,018 | $33,767,965 | $9,121,590 | $9,854,767 | $14,315,302 | $16,050,244 |
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