The reason they ask for each year is to confirm your income was sufficient to support family for each given year. As the family size can change on based of Birth or Death of family member for a given period of time. Weather this criteria of IRCC is good or bad, This is what they have decided to do.I see. But they already know what is my family size (me + co-signer+dependent+applicant) and they can check it against the income table.
What is the point of asking for family size in the employment history for every year if the answer for family size is going to be the same as my current family size?