user: Question: What is the average pots of alfa romeo v12 after 1983?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Pts.']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1981.0, 'Osella Squadra Corse', 'Osella FA1B', 'Ford Cosworth DFV V8', 0.0]
SQL:

assistant: SELECT AVG("Pts.") FROM "Table" WHERE "Engine" = 'alfa romeo v12' AND "Year" > 1983.0;