How do I determine (get, not set) the number of records that are being displayed on a page? As an example, I may have two full pages of data, or I may only have one and a half. I want to be able to somehow tell that the first example has 20 records (if 10 per page) with 10 on the last page and the second example has 15 records with only 5 on the last page.

Is there any formula field that will allow me to do this by perhaps placing a total at the bottom of the page that counts the records on the current page? I want to avoid marking up my report as much as possible with extra text, so I would like to do this by adding as few fields as possible.