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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $1,535,511 | $3,999,214 | $1,169,561 | $619,271 | $816,836 | $440,279 | $160,593 |
| Electrical insulators, of ceramics | $2,382,319 | $3,327,589 | $4,152,895 | $2,960,596 | $2,137,835 | $3,961,844 | $4,928,944 |
| Electrical insulators of any mat. other than glass & ceramics | $16,059,562 | $20,685,746 | $31,611,205 | $22,460,420 | $13,541,003 | $18,440,157 | $16,320,437 |
| Total | $19,977,392 | $28,012,549 | $36,933,661 | $26,040,287 | $16,495,674 | $22,842,280 | $21,409,974 |
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