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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $694,413 | $1,710,547 | $1,335,566 | $799,160 | $893,395 | $988,414 | $847,483 |
| Electrical insulators, of ceramics | $10,016,389 | $14,576,403 | $17,170,106 | $19,241,645 | $14,544,244 | $15,539,706 | $19,025,989 |
| Electrical insulators of any mat. other than glass & ceramics | $12,478,696 | $16,090,365 | $12,783,061 | $17,351,040 | $15,583,099 | $22,240,870 | $19,661,994 |
| Total | $23,189,498 | $32,377,315 | $31,288,733 | $37,391,845 | $31,020,738 | $38,768,990 | $39,535,466 |
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