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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $618,559 | $261,829 | $338,361 | $12,323,912 | $3,454,997 | $6,016,924 | $11,190,715 |
| Electrical insulators, of ceramics | $12,167,335 | $6,203,206 | $9,445,625 | $13,696,332 | $9,871,359 | $15,267,314 | $19,723,079 |
| Electrical insulators of any mat. other than glass & ceramics | $6,629,186 | $6,999,471 | $7,303,109 | $21,234,211 | $9,768,715 | $14,016,474 | $16,954,915 |
| Total | $19,415,080 | $13,464,506 | $17,087,095 | $47,254,455 | $23,095,071 | $35,300,712 | $47,868,709 |
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