The 50 noirs seem to have a much wider divergence in quality, with more highly ranked films on a percentage basis; but they also have more films on the low end of quality. The 40s have a more "normal" distribution.
These combine the 77 films seen in the earlier graphs with another 185 films, displaying a total of 262. The films not shown here are domestic films from outside the 40s/50s and all international films. 153 of the films charted here are from the 40s; 109 are from the 50s.