(10)However, the annual cohort requirement as a unit of account for groups of insurance and investment contracts does not always reflect the business model, nor the legal and contractual features of intergenerationally-mutualised and cash flow matched contracts referred to recitals 5 and 6. Those contracts represent more than 70 % of the total life insurance liabilities in the Union. The annual cohort requirement applied to such contracts does not always have a favourable cost-benefit balance.