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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $23,750 | $155,552 | $7,118 | $2,184,139 | $31,510 | $393,805 | $74,972 |
| Electrical insulators, of ceramics | $6,174,585 | $5,706,091 | $5,907,050 | $12,631,970 | $8,509,235 | $5,442,059 | $6,590,538 |
| Electrical insulators of any mat. other than glass & ceramics | $2,491,859 | $5,322,108 | $4,326,014 | $14,729,311 | $6,224,734 | $3,250,523 | $9,170,514 |
| Total | $8,690,194 | $11,183,751 | $10,240,182 | $29,545,420 | $14,765,479 | $9,086,387 | $15,836,024 |
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