The weighted average duration of the Swiss corporate bond and Eurobond market index is calculated on the basis of a portfolio of fixed-rate coupon securities issued in US dollars with a remaining maturity of at least 360 days and an issue volume of at least $500 million. The index includes securities that were quoted on the Cbonds website for at least 16 trading days last month and have a credit rating of at least B3/B - from at least two leading ones, the list of issues forming the index is revised, as well as new issues are included on a monthly basis.