CREATE TABLE table_69955 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Pts." FLOAT)

What is the average pots of Alfa Romeo v12 after 1983?
SELECT AVG("Pts.") FROM table_69955 WHERE "Engine" = 'alfa romeo v12' AND "Year" > '1983'
SELECT AVG("Pts.") FROM "table_69955" WHERE "Engine" = 'alfa romeo v12' AND "Year" > '1983'