Who is the mInister who left office during 1960?
CREATE TABLE "list_of_ghanaian_foreign_ministers" (
  "number" real,
  "minister" text,
  "took_office" text,
  "left_office" text,
  "government" text,
  "party" text
);
SELECT "minister" FROM "list_of_ghanaian_foreign_ministers" WHERE "left_office"='1960';