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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $29,875,160 | $30,934,684 | $28,805,828 | $34,965,522 | $29,122,089 | $29,608,492 | $47,169,362 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $94,197,634 | $91,586,163 | $114,054,883 | $121,140,766 | $97,973,682 | $104,297,916 | $108,018,100 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $8,783,124 | $9,571,208 | $6,636,126 | $10,280,692 | $6,174,390 | $3,356,969 | $6,267,301 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $108,645,359 | $127,673,175 | $172,796,989 | $155,752,061 | $179,893,793 | $143,435,549 | $185,924,916 |
| Total | $241,501,277 | $259,765,230 | $322,293,826 | $322,139,041 | $313,163,954 | $280,698,926 | $347,379,679 |
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