The index was developed with a base value of 200 as of March 15, 1996.

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The index is measured from a base rate of 100 when it was first recorded in 1996.

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The index was developed on December 19, 1990 with a base value of 100.

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The Nikkei Currency Index series plots changes in the effective exchange rate against a base value of 100 for the value in 2005.

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