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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $24,774,000 | $28,246,000 | $21,756,000 | $24,292,000 | $23,235,000 | $23,556,021 | $24,082,321 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $28,474,000 | $35,670,000 | $33,786,000 | $45,302,000 | $27,064,000 | $29,417,204 | $39,738,419 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $7,903,000 | $16,851,000 | $8,753,000 | $16,247,000 | $6,745,000 | $15,393,555 | $11,724,561 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $58,942,000 | $87,046,000 | $90,042,000 | $91,884,000 | $94,926,000 | $73,855,676 | $86,863,478 |
| Total | $120,093,000 | $167,813,000 | $154,337,000 | $177,725,000 | $151,970,000 | $142,222,456 | $162,408,779 |
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