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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $27,492,777 | $2,988,966 | $2,365,671 | $3,574,207 | $1,617,174 | $2,460,241 | $2,443,132 |
| Electrical insulators, of ceramics | $29,213,564 | $31,895,692 | $31,324,559 | $35,504,573 | $14,667,104 | $14,497,658 | $11,045,570 |
| Electrical insulators of any mat. other than glass & ceramics | $38,829,068 | $41,461,387 | $45,330,594 | $53,936,150 | $33,443,832 | $33,400,154 | $37,580,539 |
| Total | $95,535,409 | $76,346,045 | $79,020,824 | $93,014,930 | $49,728,110 | $50,358,053 | $51,069,241 |
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