185.The actuarial value of the additional benefits referred to in section 183 and pertaining to years and parts of a year referred to in paragraphs 1 to 3 of section 104 of this Act and, where applicable, in paragraphs 1 to 3 of section 73.1 of the Act respecting the Government and Public Employees Retirement Plan (chapter R-10) in respect of which benefits are vested after 31 December 1999 shall be established at 1 January of each year in which benefits are vested. Each of the actuarial values shall be computed during the year following the year of vesting, on the basis of the assumptions used in the actuarial valuation filed under section 171 and available before the end of the year of the computation. Each of the actuarial values shall bear interest from 1 January of the year of vesting.