user: Question: Name the sum of points for 1991
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1989.0, 'Equipe Larrousse', 'Lola LC89', 'Lamborghini V12', 0.0]
SQL:

assistant: SELECT SUM("Points") FROM "Table" WHERE "Year" = 1991.0;