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

### Instruction:
How many were in Attendance on February 21, 1988 against the New Jersey Saints?

### Inputs:
table_name: table, columns: ['Date', 'at/vs.', "Opponent'", "Score'", 'Attendance', 'Record']

### Response:
SELECT SUM Attendance FROM table WHERE Opponent' = new jersey saints AND Date = february 21, 1988