user: ### NOW ANSWER:
Question: What's the top year with the Chassis ATS HS1?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1976.0, 'Team Ensign', 'Ensign N176', 'Cosworth V8', 0.0]
SQL:

assistant: SELECT MAX("Year") FROM "Table" WHERE "Chassis" = 'ATS HS1';