Calculating UIF Payments for Part-Time Employees

I am currently managing payroll for a small business and need to ensure accurate UIF (Unemployment Insurance Fund) contributions for our part-time employees. I understand the basic calculation for full-time employees, but I am unsure how to adjust this for part-time workers who have variable hours and earnings each week.

Could someone explain how to calculate UIF payments for part-time employees? Are there specific guidelines or formulas I should follow to stay compliant with the regulations? Any examples or resources would be greatly appreciated!