Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
before week 12 what was the attendance on 1983-11-21?

### Inputs:
table_name: table, columns: ['Week', 'Date', 'Opponent', 'Result', 'Game site', 'Attendance']

### Response:
SELECT SUM Attendance FROM table WHERE Date = 1983-11-21 AND Week < 12