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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $2,240,946 | $3,752,034 | $7,663,224 | $9,609,789 | $4,644,332 | $3,561,298 | $4,514,559 |
| Electrical insulators, of ceramics | $10,673,667 | $14,116,454 | $19,466,623 | $22,517,444 | $28,617,223 | $25,417,446 | $35,245,805 |
| Electrical insulators of any mat. other than glass & ceramics | $3,659,326 | $6,185,696 | $11,729,236 | $13,606,883 | $9,864,792 | $12,240,937 | $32,747,368 |
| Total | $16,573,939 | $24,054,184 | $38,859,083 | $45,734,116 | $43,126,347 | $41,219,681 | $72,507,732 |
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