Question: In which year did this city file the municipal bankruptcy, whose decline was documented in the 2012 documentary film, "Detropia?"
Sentence (from "Decline of Detroit"): The population of the city has fallen from a high of 1,850,000 in 1950 to 677,116 in 2015, kicking it off the top 20 of US cities by population for the first time since 1850.
Relevant evidence: No