user: ### NOW ANSWER:
Question: Which year has a total of 0 points and a chassis of Toleman TG181?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1981.0, 'Candy Toleman Motorsport', 'Toleman TG181', 'Hart 415T 1.5 L4 t', 0.0]
SQL:

assistant: SELECT AVG("Year") FROM "Table" WHERE "Points" = 0.0 AND "Chassis" = 'Toleman TG181';