Well, if you're statistics are wrong you should probably run the statistics tool? 
The N/A simply refers to the number of entries to be recounted per page but as the number of statistics to recount are always the same you don't need to set the per page value.

The N/A simply refers to the number of entries to be recounted per page but as the number of statistics to recount are always the same you don't need to set the per page value.
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