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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $1,929,039 | $2,205,013 | $1,789,182 | $1,832,441 | $347,138 | $447,832 | $720,989 |
| Electrical insulators, of ceramics | $3,582,870 | $7,124,618 | $7,444,371 | $6,108,401 | $5,058,363 | $5,001,730 | $8,207,345 |
| Electrical insulators of any mat. other than glass & ceramics | $22,892,112 | $16,590,254 | $21,497,598 | $24,671,939 | $17,363,312 | $18,438,451 | $20,056,774 |
| Total | $28,404,021 | $25,919,885 | $30,731,151 | $32,612,781 | $22,768,813 | $23,888,013 | $28,985,108 |
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