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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $8,647,122 | $7,882,273 | $7,981,900 | $15,473,474 | $14,419,961 | $15,458,538 | $21,166,367 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $19,054,106 | $18,768,598 | $22,271,524 | $36,483,647 | $21,365,212 | $17,535,408 | $28,398,453 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $1,683,166 | $1,110,249 | $5,329,343 | $2,873,614 | $12,478 | $254,141 | $6,261,594 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $11,447,660 | $14,249,586 | $12,314,139 | $11,807,579 | $32,326,338 | $24,964,874 | $33,338,763 |
| Total | $40,832,054 | $42,010,706 | $47,896,906 | $66,638,314 | $68,123,989 | $58,212,961 | $89,165,177 |
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