for instance in some countries such as ireland and the united kingdom children typically enter primary education at age while in estonia finland latvia poland and sweden they typically enter at age in all the other countries children typical enter primary education at age in preprimary education annual expenditure per child for both public and private settings averages usd in oecd countries while annual expenditure for early childhood educational development averages usd in early childhood educational development isced public sources account for an average of of total expenditure while in preprimary education isced it amounts to