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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $49,372 | $4,518,902 | $3,845,789 | $38,951 | $48,222 | $17,921,344 | $3,938,644 |
| Electrical insulators, of ceramics | $1,681,496 | $5,860,192 | $3,998,411 | $4,289,248 | $17,186,610 | $16,027,519 | $31,433,123 |
| Electrical insulators of any mat. other than glass & ceramics | $1,031,744 | $1,055,455 | $1,001,355 | $2,804,208 | $4,153,546 | $8,913,337 | $7,943,421 |
| Total | $2,762,612 | $11,434,549 | $8,845,555 | $7,132,407 | $21,388,378 | $42,862,200 | $43,315,188 |
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