user: Question: What year did the rank of 31 happen in?
Columns: ['Year', 'Start', 'Qual', 'Rank', 'Finish', 'Laps']
Types: ['text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['1958', '32', '143.272', '13', '15', 151.0]
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Rank" = '31';