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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $215,887 | $575,980 | $231,581 | $1,747,831 | $2,868,930 | $1,171,913 | $771,179 |
| Electrical insulators, of ceramics | $9,754,299 | $18,958,666 | $25,357,929 | $42,699,103 | $10,090,139 | $18,158,737 | $11,644,951 |
| Electrical insulators of any mat. other than glass & ceramics | $32,623,349 | $34,221,403 | $36,623,889 | $31,505,786 | $18,733,676 | $17,214,575 | $15,824,457 |
| Total | $42,593,535 | $53,756,049 | $62,213,399 | $75,952,720 | $31,692,745 | $36,545,225 | $28,240,587 |
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