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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Producer gas/water gas generators, with/without their purifiers; acetylene ... | $624,797 | $12,706 | $3,353,132 | $1,241,974 | $148,706 | $6,430,935 | $528,421 |
| Parts of the producer gas/water gas generators/acetylene gas & sim. water p ... | $136,733 | $15,727,917 | $5,613,104 | $66,984 | $62,420 | $801,855 | $4,956,106 |
| Total | $761,530 | $15,740,623 | $8,966,236 | $1,308,958 | $211,126 | $7,232,790 | $5,484,527 |
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