Article 88
1. The rate for the calculation of compound interest shall be the effective rate referred to in paragraphs 2 and 3 and shall, if necessary, be revised on the occasion of the five-yearly actuarial assessments. 2. The interest rates to be taken into consideration for the actuarial calculations shall be based on the observed average annual interest rates on the long-term public debt of the Member States as published by the European Commission. An appropriate consumer price index shall be used to calculate the corresponding interest rate net of inflation as needed for the actuarial calculations. 3. The effective annual rate to be taken into consideration for the actuarial calculations shall be the average of the real average interest rates for the 12 years preceding the current year.