user: Question: The 147.481 Qual, happened in what year?
Columns: ['Year', 'Start', 'Qual', 'Rank', 'Finish', 'Laps']
Types: ['text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['1957', '2', '143.872', '3', '23', 105.0]
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Qual" = '147.481';