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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $77,681 | $590,898 | $365,823 | $327,884 | $461,446 | $1,209,198 | $106,032 |
| Electrical insulators, of ceramics | $723,152 | $667,491 | $280,144 | $341,326 | $131,522 | $739,755 | $409,384 |
| Electrical insulators of any mat. other than glass & ceramics | $887,933 | $602,856 | $1,273,373 | $953,057 | $885,442 | $1,262,949 | $1,703,560 |
| Total | $1,688,766 | $1,861,245 | $1,919,340 | $1,622,267 | $1,478,410 | $3,211,902 | $2,218,976 |
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