For what year is the type of record 'total attendance-regular season?
CREATE TABLE "table1_21436373_5" (
  "type_of_record" text,
  "attendance" real,
  "date_year" text,
  "stadium" text,
  "result_games" text
);
SELECT "date_year" FROM "table1_21436373_5" WHERE "type_of_record"='Total Attendance-Regular season';