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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $2,326,738 | $1,394,669 | $3,196,993 | $2,211,239 | $2,044,259 | $2,414,547 | $1,915,558 |
| Electrical insulators, of ceramics | $16,409,954 | $19,066,213 | $24,752,287 | $22,106,724 | $18,983,139 | $22,057,877 | $15,837,508 |
| Electrical insulators of any mat. other than glass & ceramics | $50,592,988 | $32,620,385 | $38,806,066 | $35,382,463 | $22,140,869 | $25,890,738 | $30,556,733 |
| Total | $69,329,680 | $53,081,267 | $66,755,346 | $59,700,426 | $43,168,267 | $50,363,162 | $48,309,799 |
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