You're right, "sortie" is the release in the cinemas, and "entrées" are the number of people who've been to see the film.

this is in usa

French term (edited): entrées (en salle)

I think you'll find that's the proper term used in the industry to denote bums-on-seats

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Note added at 22 hrs (2008-05-30 06:59:48 GMT)
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And of course, 'sortie en salle' is 'theatrical release' — even though it's a cineam, the old term has stayed in use.

40,5 % des films sortis en salle en 2006 sont piratés sur internet l’année de leur sortie. 69 % pour les films américains (qui ont généré 93 % des entrées salles des films américains) et 29 % des films français (qui ont généré 61 % des entrées salles des films français)

40.5% of films released in 2006 were pirated the same year. This figure comprises 69% of American films (which generated 93% of admissions to American films) and 29% of French films (which generated 61% of admissions to French films).

The distinction is that people are pirating the higher-grossing films. That is why only 69% of Am. films generate 93% of the profits.

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Note added at 5 days (2008-06-03 18:36:31 GMT)
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To one reader it was not clear that by 'admissions' I meant payment for viewing the film. He is correct in suggesting transposing the modifier to "93% of US film admissions" and "61% of French film admissions"?

Thanks for your helpfulness - please keep in mind that kudoz are a volunteer operation and there is no need to be snide with someone you are correcting.