How many consecutive starts for the linebacker who played from 9/21/1975 – 12/16/1984?
CREATE TABLE "linebackers" (
  "position" text,
  "player" text,
  "period" text,
  "teams" text,
  "consecutive_starts" real,
  "playoffs" real,
  "total" real
);
SELECT MAX("total") FROM "linebackers" WHERE "period"='9/21/1975 – 12/16/1984';