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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Producer gas/water gas generators, with/without their purifiers; acetylene ... | $3,934,960 | $9,739,348 | $14,017,094 | $16,890,498 | $17,606,627 | $31,250,089 | $45,682,844 |
| Parts of the producer gas/water gas generators/acetylene gas & sim. water p ... | $4,145,105 | $5,012,776 | $3,044,012 | $2,917,580 | $2,472,904 | $2,807,499 | $5,150,386 |
| Total | $8,080,065 | $14,752,124 | $17,061,106 | $19,808,078 | $20,079,531 | $34,057,588 | $50,833,230 |
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