user: Question: What Attendance has a Result of L12–21?
Columns: ['Date', 'Opponent', 'Site', 'Result', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['September 23, 1967', 'Oklahoma State', 'War Memorial Stadium • Little Rock, AR', 'L6–7', '53,000']
SQL:

assistant: SELECT "Attendance" FROM "Table" WHERE "Result" = 'L12–21';