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| Chapter | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Iron and steel | $178,104,707 | $284,157,200 | $274,613,492 | $239,582,173 | $114,427,233 | $146,447,559 | $148,742,382 |
| Articles of iron or steel | $96,886,041 | $180,610,683 | $258,502,125 | $210,558,046 | $172,506,757 | $276,492,186 | $313,284,988 |
| Copper and articles thereof | $434,956,138 | $1,372,538,992 | $1,457,838,474 | $1,624,138,942 | $813,293,540 | $1,011,070,812 | $1,360,672,927 |
| Nickel and articles thereof | $185,501 | $27,568 | $385,874 | $63,841 | $90,054 | $269,967 | $364,071 |
| Aluminum and articles thereof | $22,045,096 | $28,063,495 | $31,527,918 | $28,017,649 | $19,764,561 | $29,002,011 | $39,880,355 |
| Lead and articles thereof | $929,789 | $3,365,228 | $8,311,911 | $4,345,723 | $2,262,411 | $7,061,612 | $9,083,302 |
| Zinc and articles thereof | $2,017,140 | $3,730,842 | $3,034,754 | $1,779,402 | $1,693,432 | $2,547,676 | $2,712,792 |
| Tin and articles thereof | $3,983,780 | $7,962,406 | $16,650,858 | $27,920,039 | $15,306,504 | $20,459,835 | $38,168,153 |
| Other base metals; cermets; articles thereof | $1,249,183 | $434,419 | $514,034 | $158,272 | $166,354 | | $233,908 |
| Tools, implements, cutlery, spoons and forks, of base metal | $12,240,888 | $11,765,488 | $5,449,914 | $14,017,918 | $11,244,347 | $6,955,639 | $7,381,889 |
| Miscellaneous articles of base metal | $53,231,381 | $57,027,160 | $72,499,542 | $55,557,015 | $53,246,825 | $80,258,345 | $107,523,895 |
| Total | $805,829,644 | $1,949,683,481 | $2,129,328,896 | $2,206,139,020 | $1,204,002,018 | $1,580,565,642 | $2,028,048,662 |
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