user: Question: What is total amount of points of entrants with a ford cosworth engine and a year later than 1991?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1989.0, 'Roni Motorsport', 'Reynard 89D', 'Cosworth', 2.0]
SQL:

assistant: SELECT SUM("Points") FROM "Table" WHERE "Engine" = 'ford cosworth' AND "Year" > 1991.0;