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| Chapter | 2005 | 2007 | 2010 | 2011 |
| Iron and steel | $24,222,241 | $32,618,034 | $24,729,648 | $18,739,709 |
| Articles of iron or steel | $5,043,843 | $3,691,543 | $6,663,319 | $9,375,307 |
| Copper and articles thereof | $160,199 | $530,796 | $28,288 | $35,314 |
| Aluminum and articles thereof | $601,559 | $453,103 | $6,227,262 | $9,059,715 |
| Lead and articles thereof | | | $11,660 | $34,251 |
| Zinc and articles thereof | $5,147 | $32,095 | $10,983 | $9,269 |
| Tin and articles thereof | $2,073 | | | |
| Tools, implements, cutlery, spoons and forks, of base metal | $7,418 | $254,697 | $96,260 | $168,114 |
| Miscellaneous articles of base metal | $116,188 | $80,870 | $1,772,711 | $2,584,928 |
| Total | $30,158,668 | $37,661,138 | $39,540,131 | $40,006,607 |
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