The technical provisions referred to in 1° of Article R. 343-1, corresponding to the operations referred to in Articles L. 143-1 of this Code, L. 222-3 of the Mutual Code or L. 932-40 of the Social Security Code, are valued each year by an actuary and reviewed by the actuarial function, which verifies that the provisions comply with the provisions of this Code applicable to them, that they are constituted in a sufficiently prudent manner, taking account, where appropriate, of an adequate margin for adverse deviations, and that the methods and bases for calculating these technical provisions remain generally constant from one financial year to the next. However, a change in these methods may be justified, in compliance with the provisions of this code, by a change in the legal, demographic or economic data on which these assumptions are based.