What year was the Honda ra168e 1.5 v6 t engine used?
CREATE TABLE "works_team_entries" (
  "year" real,
  "chassis" text,
  "engine" text,
  "tyres" text,
  "pts" text
);
SELECT "year" FROM "works_team_entries" WHERE "engine"='honda ra168e 1.5 v6 t';