user: Question: Name the total number of years for brm straight-4
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1966.0, 'Tyrrell Racing Organisation', 'Matra MS5 (F2)', 'BRM Straight-4', 0.0]
SQL:

assistant: SELECT SUM("Year") FROM "Table" WHERE "Engine" = 'brm straight-4';