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An index of the strength of the US dollar based on a weighted group of first-world currencies. In that index, the euro accounts for 57,6%, the Japanese yen is 13,6%, the British pound is 11,9% and the Canadian dollar is 9,1%. The index began in 1973 with a nominal value of 100. It reached a high of 165,7 in 1985, but has basically been falling ever since. Obviously, like any currency, the US dollar's strength over the long term is a function of how its economy is performing against the other economies of the world. The basket was changed once when the euro came into being and it is now overdue for adjustment because of the development of various emerging economies.