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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $2,684,966 | $2,616,333 | $2,205,942 | $4,083,526 | $2,543,522 | $3,460,446 | $2,911,958 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $23,436,648 | $23,637,407 | $30,240,916 | $25,191,209 | $18,463,545 | $22,550,434 | $32,650,369 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $7,151 | $369,917 | $483,684 | $431,563 | $442,967 | $1,092,760 | $751,586 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $8,640,106 | $14,856,241 | $12,767,502 | $23,098,198 | $12,070,179 | $12,417,183 | $16,525,675 |
| Total | $34,768,871 | $41,479,898 | $45,698,044 | $52,804,496 | $33,520,213 | $39,520,823 | $52,839,588 |
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