Unless otherwise established in the collective bargaining agreements, no more than 20% of employees out of the total number of open term employees can be hired under a fixed-term agreement effective from 1 June of the hiring year. Exceeding this quota leads to an administrative fine of: (i) 20% of the salary paid, for each month or fraction of the month exceeding 15 days of employment, if the number of workers hired in violation of the percentage limit does not exceed 1; ii) 50% of the salary paid for each month or fraction of the month exceeding 15 days of employment, if more than one worker is involved.