This is my #1 film of every year since 1911, in chronological order. I've used the dates on IMDb (which are virtually identical to Letterboxd) to determine this list.
Honourable mentions are in the notes.
My criteria was to only include feature-length films (miniumum 40 minutes) so no short films and no TV shows. Feature-length documentaries are allowed. As the oldest surviving feature-length film dates to 1911, that seemed a natural limit to place on this list.
For my list of favourite films not restricted by year, see here.
Most of the silent films can be found for free on YouTube.