It is part of a list of comments on the information provided in a federal statistics inquiry form on employee headcount, wages, and hours worked.

I know all the words but can't pull it together in a nice way.

Maybe someone here has seen these things in English before?

Средняя численность исчисляется, исходя из учета этих работников за каждый календарный день как целых единиц в течение всего срока действия договора.

Thanks!