Tell me the number range for 1965-66
CREATE TABLE "fleet_details" (
  "class" text,
  "type" text,
  "no_built_converted" text,
  "year_built_converted" text,
  "no_range" text,
  "withdrawn" real
);
SELECT "no_range" FROM "fleet_details" WHERE "year_built_converted"='1965-66';