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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $10,587,998 | $25,502,769 | $7,123,025 | $316,226 | $434,756 | $290,178 | $246,495 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $26,782,599 | $7,791,433 | $19,415,443 | $39,593,954 | $48,824,673 | $20,447,776 | $37,176,399 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | | | $163,154 | $96,595 | $11,106 | $8,284 | $499 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $18,368,567 | $20,578,910 | $22,789,793 | $21,846,873 | $18,222,931 | $16,734,380 | $16,366,598 |
| Total | $55,739,164 | $53,873,112 | $49,491,415 | $61,853,648 | $67,493,466 | $37,480,618 | $53,789,991 |
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