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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $13,870,208 | $31,606,707 | $34,415,848 | $14,756,869 | $7,495,033 | $5,233,628 | $4,955,909 |
| Electrical insulators, of ceramics | $49,250,105 | $53,080,675 | $51,629,767 | $74,853,951 | $67,168,240 | $73,071,832 | $54,033,418 |
| Electrical insulators of any mat. other than glass & ceramics | $212,661,561 | $207,959,084 | $193,703,775 | $197,833,945 | $159,926,654 | $182,459,383 | $187,045,379 |
| Total | $275,781,874 | $292,646,466 | $279,749,390 | $287,444,765 | $234,589,927 | $260,764,843 | $246,034,706 |
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