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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $6,147,052 | $6,969,241 | $12,452,057 | $10,227,247 | $10,712,368 | $11,530,472 | $16,102,872 |
| Electrical insulators, of ceramics | $11,624,322 | $14,008,091 | $18,361,050 | $20,758,673 | $14,012,555 | $11,472,016 | $12,896,967 |
| Electrical insulators of any mat. other than glass & ceramics | $4,132,048 | $5,719,142 | $7,541,521 | $7,382,873 | $10,422,885 | $11,246,584 | $13,677,452 |
| Total | $21,903,422 | $26,696,474 | $38,354,628 | $38,368,793 | $35,147,808 | $34,249,072 | $42,677,291 |
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