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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $7,521,388 | $4,802,415 | $4,417,141 | $3,734,327 | $10,192,948 | $6,547,832 | $7,432,935 |
| Electrical insulators, of ceramics | $22,973,834 | $26,241,996 | $28,189,229 | $28,532,622 | $31,254,401 | $31,908,582 | $29,944,248 |
| Electrical insulators of any mat. other than glass & ceramics | $29,513,913 | $35,263,659 | $33,351,144 | $33,105,550 | $32,097,517 | $35,735,215 | $46,777,624 |
| Total | $60,009,135 | $66,308,070 | $65,957,514 | $65,372,499 | $73,544,866 | $74,191,629 | $84,154,807 |
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