The European Central Bank established the compulsory intervention rates for Bulgarian lev and Croatian kuna following their inclusion in ERM II. As of 13 July 2020 the lower rate for the Bulgarian lev is set at 1.66246 per 1 euro, the upper rate – at 2.24920, with the standard 15% margin around the central rate. Bulgaria joined ERM II with its existing currency board in place, with the lev pegged to the euro at a rate of 1.95583:1. The ECB evaluates the currency board exchange rate as adequate and sustainable without setting down any additional requirements.