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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $1,045,368 | $714,879 | $4,012,719 | $11,446,776 | $10,960,676 | $6,672,766 | $7,499,701 |
| Electrical insulators, of ceramics | $3,471,533 | $3,821,587 | $7,807,193 | $16,237,611 | $15,411,554 | $12,380,289 | $15,590,233 |
| Electrical insulators of any mat. other than glass & ceramics | $10,726,282 | $11,418,980 | $24,685,743 | $16,761,441 | $9,418,678 | $13,937,274 | $14,977,569 |
| Total | $15,243,183 | $15,955,446 | $36,505,655 | $44,445,828 | $35,790,908 | $32,990,329 | $38,067,503 |
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