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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $9,668,260 | $12,424,287 | $15,173,253 | $19,190,511 | $13,769,104 | $15,186,187 | $15,284,273 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $31,008,053 | $26,052,023 | $24,266,130 | $36,518,459 | $55,280,972 | $22,490,101 | $33,183,330 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $444,289 | $638,265 | $187,942 | $219,348 | $1,101,199 | $2,089,691 | $78,909 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $59,503,527 | $68,876,725 | $71,678,797 | $75,122,943 | $73,564,163 | $57,844,368 | $54,844,455 |
| Total | $100,624,129 | $107,991,300 | $111,306,122 | $131,051,261 | $143,715,438 | $97,610,347 | $103,390,967 |
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