user: Question: what is the least year for 4 points?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1956.0, 'Scuderia Ferrari', 'Lancia-Ferrari D50', 'Ferrari V8', 0.0]
SQL:

assistant: SELECT MIN("Year") FROM "Table" WHERE "Points" = 4.0;