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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $19,467 | $107,719 | $199,828 | $1,442,049 | $2,474,251 | $1,108,889 | $612,121 |
| Electrical insulators, of ceramics | $7,121,016 | $12,749,568 | $16,638,329 | $22,010,918 | $9,125,663 | $13,031,593 | $6,145,340 |
| Electrical insulators of any mat. other than glass & ceramics | $11,146,217 | $16,043,735 | $12,929,870 | $20,173,467 | $15,346,205 | $15,107,785 | $17,668,673 |
| Total | $18,286,700 | $28,901,022 | $29,768,027 | $43,626,434 | $26,946,119 | $29,248,267 | $24,426,134 |
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