When determining the calculation base, the issues of government securities (CO) in circulation during its entire validity period are taken into account. The calculation base can be determined separately for the GS market and the KO market. They are calculated based on the results of each trading day based on calculated weighted average prices and the number of bonds in circulation for issues included in the calculation base. If it is impossible to determine the weighted average issue price at the time of the index calculation, the current issue value, determined in accordance with the legislation, is taken into account. The index is calculated with an accuracy of 2 decimal places. The initial value of each index is assumed to be 100 points.