These are the 250 actors that I've seen the most.
I gave points based on the number of movies I've seen and how big the roles were and added it all up.
The points awarded and deciding whether a role is e.g. a major supporting role or normal supporting role are somewhat arbitrary. So the results are not 100% correct but still give a broad idea where the actors are placed.
I wish I could just add up the screentime for every movie and actor, which would obviously be much more precise, but unfortunately we still don't have that technology.
Anyways, here is my point system:
Leading Role: 1.0
Major Supporting Role: 0.7
Supporting Role: 0.4
Small Supporting Role or Synchronisation: 0.1
Short Films: 0.4 x role type
TV Series: 0.5 for every season x role type
Tiebreaker: most recently watched film