user: ### NOW ANSWER:
Question: In what Year did the norton Team have 0 Points and 350cc Class?
Columns: ['Year', 'Class', 'Team', 'Points', 'Wins']
Types: ['real', 'text', 'text', 'real', 'real']
Sample row: [1959.0, '125cc', 'Ducati', 2.0, 0.0]
SQL:

assistant: SELECT AVG("Year") FROM "Table" WHERE "Class" = '350cc' AND "Team" = 'norton' AND "Points" < 0.0;