Euro
The European Central Bank (ECB) revamped its TWI in 2004 to reflect trade in services, identify new trading partners, and indicate a clearer picture of manufacturing. Their index is chain linked to indicate imports, exports, and competitor nations. They readjust their index every three years so the new chain link from 2004 is properly reflected. The new link occurred in 2010 with completed 2009 trade data.
Due to the size and complexity of euro zone nations, the ECB formulated and categorized many indices in order of importance to euro zone trade. The standard 12-nation currency index incorporates major trading partners of the euro zone. The list and their weights are:
| Country | Weight |
| Australia | 1.0 |
| United States | 19.6 |
| United Kingdom ... |
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