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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $91,932 | $479,344 | $188,386 | $646,427 | $20,155 | $123,464 | $829,169 |
| Electrical insulators, of ceramics | $2,054,015 | $2,890,001 | $1,113,030 | $5,026,266 | $4,570,875 | $6,730,146 | $3,515,613 |
| Electrical insulators of any mat. other than glass & ceramics | $2,668,060 | $1,029,205 | $317,398 | $681,341 | $286,284 | $370,039 | $510,471 |
| Total | $4,814,007 | $4,398,550 | $1,618,814 | $6,354,034 | $4,877,314 | $7,223,649 | $4,855,253 |
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