This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

Long a major population center and site of worldwide automobile manufacturing, Detroit has suffered a long economic decline produced by numerous factors. Like many industrial American cities, Detroit reached its population peak in the 1950 census. The peak population was 1.8 million people. Following suburbanization, industrial restructuring, and loss of jobs (as described above), by the 2010 census, the city had less than 40 percent of that number, with just over 700,000 residents. The city has declined in population in each census since 1950.
In which year did Detroit's population peak?