Show HN: Movie ratings over time using the Wayback Machine Posted by abrena on Sunday May 15, 2016 @12:10PM from the show-hn dept. https://github.com/abrenaut/mrot ( 1 comment | 3 points | on HN )
You can even apply diffs retroactively (I think) to get older ratings:
ftp://ftp.funet.fi/pub/mirrors/ftp.imdb.com/pub/diffs/
(via http://www.imdb.com/interfaces)