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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $724,644 | $641,392 | $1,907,599 | $1,671,650 | $1,347,456 | $2,038,598 | $12,010,966 |
| Electrical insulators, of ceramics | $8,606,998 | $9,782,238 | $10,823,710 | $14,755,001 | $16,802,056 | $18,783,188 | $24,087,199 |
| Electrical insulators of any mat. other than glass & ceramics | $4,158,705 | $6,792,911 | $8,447,703 | $9,291,497 | $5,704,032 | $9,179,205 | $16,048,893 |
| Total | $13,490,347 | $17,216,541 | $21,179,012 | $25,718,148 | $23,853,544 | $30,000,991 | $52,147,058 |
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