CREATE TABLE table_27131 ("Week" FLOAT, "Date" TEXT, "Kickoff" TEXT, "Opponent" TEXT, "Final score" TEXT, "Team record" TEXT, "Game site" TEXT, "Attendance" FLOAT)

What was the largest attendance at the Rheinstadion?
SELECT MAX("Attendance") FROM table_27131 WHERE "Game site" = 'Rheinstadion'
SELECT MAX("Attendance") FROM "table_27131" WHERE "Game site" = 'Rheinstadion'