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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $21,185,933 | $14,531,834 | $14,652,126 | $13,364,749 | $9,164,730 | $12,695,630 | $12,237,194 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $26,559,794 | $30,107,303 | $28,473,114 | $39,900,970 | $22,354,845 | $30,380,533 | $31,482,374 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $3,557,228 | $226,853 | $510,868 | $1,763,278 | $648,251 | $1,696,350 | $2,359,811 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $34,600,331 | $48,052,463 | $40,054,256 | $44,024,957 | $35,501,374 | $35,479,974 | $47,672,636 |
| Total | $85,903,286 | $92,918,453 | $83,690,364 | $99,053,954 | $67,669,200 | $80,252,487 | $93,752,015 |
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