(1) the gifts, legacies and grants made to the arts council ;
(2) the sums voted annually for that purpose out of the city’s budget ; and
(3) the sums put at the disposal of the arts council every year that have not been used before the end of the fiscal year.
The city council may, by by-law, prescribe the minimum amount that must be allocated every year for the purposes of subparagraph 2 of the first paragraph. As long as the by-law remains in force, the treasurer of the city must include the amount so prescribed in the certificate the treasurer prepares in accordance with section 474 of the Cities and Towns Act (chapter C‐19).