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In page Danish krone:

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Denmark has not introduced the euro, following a rejection by referendum in 2000, but the Danish krone is pegged closely to the euro in ERM II, the EU's exchange rate mechanism. Denmark borders one eurozone member, Germany, and one other EU member, Sweden, which is legally obliged to join the euro in the future (though Sweden maintains that joining ERM II is voluntary, thus avoiding euro adoption for the time being).