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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | | | $2,527 | $347 | $4,800 | | $66,128 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $8,240 | $80,952 | $17,565 | $314,703 | $17 | $29,410 | $43,065 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | | $174,562 | $3,991 | | | | |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $52,170 | $69,385 | $38,156 | $142,234 | $198,004 | $27,845 | $49,240 |
| Total | $60,410 | $324,899 | $62,239 | $457,284 | $202,821 | $57,255 | $158,433 |
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