CREATE TABLE table_71222 ("Date" TEXT, "Opponents" TEXT, "Result F\\u2013A" TEXT, "Attendance" FLOAT, "League position" TEXT)

What was the attendance on 21 August 2004?
SELECT SUM("Attendance") FROM table_71222 WHERE "Date" = '21 august 2004'
SELECT SUM("Attendance") FROM "table_71222" WHERE "Date" = '21 august 2004'