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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $680,147 | $2,604,516 | $4,211,224 | $4,359,770 | $1,727,817 | $351,830 | $1,355,370 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $6,398,141 | $4,311,175 | $4,584,140 | $8,033,579 | $12,064,242 | $16,557,497 | $12,878,648 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $41,370 | $6,304 | $59,166 | $38,413 | | $43,582 | $43,808 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $3,172,004 | $4,211,947 | $5,467,057 | $6,409,927 | $3,198,901 | $4,385,968 | $7,648,797 |
| Total | $10,291,662 | $11,133,942 | $14,321,587 | $18,841,689 | $16,990,960 | $21,338,877 | $21,926,623 |
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