user: ### NOW ANSWER:
Question: What year shows the Entrant of BMW Motorsport?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1971.0, 'Eifelland Wohnwagenbau', 'Brabham BT30', 'Cosworth FVA', 0.0]
SQL:

assistant: SELECT SUM("Year") FROM "Table" WHERE "Entrant" = 'BMW Motorsport';