19. The gross income referred to in section 18 must not be less than:(1) the annual income determined on the basis of the minimum wage and the regular workweek that are in force on 1 June of the year for which the computation is made, unless the worker is carrying on part-time employment and was carrying on part-time employment at the time of the accident, occupational disease or aggravation, or is unable medically to carry on full-time employment;
(2) the gross income that the worker derived from employment referred to in subparagraph 2 of section 4, and that was used as the basis for computing the financial assistance to which he was formerly entitled, unless he has since been attributed a new percentage of permanent disability subsequent to a new event mentioned in the Act to promote good citizenship (chapter C-20) or the Crime Victims Compensation Act (chapter I-6).