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DKSH Annual Report 2023 99The life expectancy post retirement as at December 31, 2023, is as follows:in years 2023 2022SwitzerlandMale 23.9 23.6 Female 25.5 25.2 The sensitivity of the defined benefit obligations to changes of significant assumptions as at December 31, 2023, is as follows:in CHF millions 2023 2022SwitzerlandDiscount rate (increase)/decrease by 0.5% (7.0)/7.5 (5.5)/6.1 Rate of salary increase/(decrease) by 0.5% 0.8/(1.2) 1.1/(1.1) Rate of pension increase/(decrease) by 0.5% 1.6/(7.8) 5.1/(5.1) Life expectancy increase/(decrease) by 1 year 3.9/(4.1) 3.2/(3.3) The weighted average duration of the defined benefit plan obligations as December 31, 2023, is 14.7 years (2022: 15.0 years).