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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Base metals/silver, clad with gold, not further worked than semi-manufactur ... | $427,660 | $483,142 | $553,823 | $1,050,932 | $1,062,971 | $766,701 | $1,520,403 |
| Total | $427,660 | $483,142 | $553,823 | $1,050,932 | $1,062,971 | $766,701 | $1,520,403 |
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