One will find that it varies month to month because there is ususally one big payer that changes the average for that field size group.

If one wants a general figure for field size, the answer is 10 ,because there are more of them, than say 11 only or 15 only.

One will note that there will be some months that show a loss , then a month with some strong payers , it becomes a patience sort of thing.

Cheers

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Cheers.