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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $739,601 | $508,850 | $354,474 | $556,327 | $348,022 | $628,106 | $931,659 |
| Electrical insulators, of ceramics | $542,987 | $355,559 | $948,491 | $1,280,773 | $689,884 | $1,026,629 | $1,186,302 |
| Electrical insulators of any mat. other than glass & ceramics | $1,505,073 | $2,693,758 | $2,112,818 | $3,852,330 | $2,534,111 | $2,760,052 | $2,966,179 |
| Total | $2,787,661 | $3,558,167 | $3,415,783 | $5,689,430 | $3,572,017 | $4,414,787 | $5,084,140 |
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