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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 |
| Electrical insulators, of glass | $2,203,136 | $2,400,861 | $3,126,258 | $4,012,415 | $3,672,536 |
| Electrical insulators, of ceramics | $3,876,531 | $4,744,176 | $5,076,776 | $6,196,015 | $4,942,065 |
| Electrical insulators of any mat. other than glass & ceramics | $1,595,223 | $2,507,295 | $6,389,535 | $13,799,340 | $5,629,760 |
| Total | $7,674,890 | $9,652,332 | $14,592,569 | $24,007,770 | $14,244,361 |
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