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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $2,922,000 | $3,462,000 | $3,625,000 | $3,741,000 | $3,740,000 | $3,041,880 | $4,230,080 |
| Electrical insulators, of ceramics | $42,987,000 | $55,023,000 | $69,107,000 | $56,015,000 | $39,214,000 | $38,075,167 | $47,878,677 |
| Electrical insulators of any mat. other than glass & ceramics | $66,846,000 | $72,028,000 | $67,042,000 | $80,452,000 | $78,550,000 | $85,907,933 | $95,248,532 |
| Total | $112,755,000 | $130,513,000 | $139,774,000 | $140,208,000 | $121,504,000 | $127,024,980 | $147,357,289 |
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