How to convert foreign currencies income to CND.

This question is about converting the income received in foreign currencies to CND. In 2024, I received pension payments in USD from a company in March, June, September, and December. I also received some USD annuity payments in July and August. I received pension payments in Hungarian currency in October, November, and December. Should I use the current conversion multiplier for each month separately, thereby filing a separate foreign slip for each payment, or can I use some average conversion figures? What should that figure be?