How many points did Team Rothmans International have after 1975 when their Chassis was a March 771?
CREATE TABLE "complete_formula_one_world_championship_" (
  "year" real,
  "entrant" text,
  "chassis" text,
  "engine" text,
  "points" real
);
SELECT "points" FROM "complete_formula_one_world_championship_" WHERE "year">1975 AND "entrant"='team rothmans international' AND "chassis"='march 771';