IMDB has ratings:
TPM: http://www.imdb.com/title/tt0120915/ratings
AotC: http://www.imdb.com/title/tt0121765/ratings
RotS: http://www.imdb.com/title/tt0121766/ratings
Not quite your categories but you could speculate some of your categories into these numbers. But the overall analysis (PT+OT) is TPM: 6.4, AotC: 6.8, RotS: 7.9
Judging by the age analysis on IMDB, minus 2-4 tenths for the OTcom age bracket.
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