Article 18
1. The Commission shall publish once a year the value of the euro in national currencies to be applied to the amounts of the overall excise duty. The exchange rates to be applied shall be those obtained on the first working day of October and published in the Official Journal of the European Union and shall apply from 1 January of the following calendar year. 2. Member States may maintain the amounts of the excise duties in force at the time of the annual adjustment provided for in paragraph 1 if the conversion of the amounts of the excise duties expressed in euro would result in an increase of less than 5 % or less than EUR 5, whichever is the lower amount, in the excise duty expressed in national currency.