It was updated weekly on Sundays. It's ranked by avg l.b. user rating, extracted from here.
Excluded shorts and TV/music. Included documentaries and festival films of 2016 that had their first national release in 2017 (i.e. Raw, Kedi). Did not include films that had some national releases in 2016 but U.S. releases delayed for 2017 (i.e. My Life as a Courgette). There was also a 100 vote minimum threshold for films to be eligible.
A link to 2016's 'official' top 50. This year I didn't do the megalist of all titles included and I didn't note down what's moved up or down, just new entrants and exits.
The list concluded on March 11th, 2018. The top 10 of the year at the end of each month was updated and noted down as a comment on the list.
[See notes for Paddington 2's eligibility.]