3. The pension shall be based upon the average salary of the officer or employee during the three highest-paid years of his service.
In computing the pension, not more than thirty-five years of service shall be counted.
In the computation provided for in the first paragraph, account may be taken of one or more fractions of a year of service; in such case, the complement of a year of service and the corresponding average pensionable salary shall be obtained from another year of service included among the best remunerated such years.
R. S. 1964, c. 14, s. 3; 1965 (1st sess.), c. 15, s. 2; 1968, c. 13, s. 1; 1973, c. 12, s. 146.