user: Question: How many were in Attendance on February 21, 1988 against the New Jersey Saints?
Columns: ['Date', 'at/vs.', "Opponent'", "Score'", 'Attendance', 'Record']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['January 9, 1988', 'at', 'Washington Wave', '13 - 14', 6624.0, 'Loss']
SQL:

assistant: SELECT "Attendance" FROM "Table" WHERE "Opponent'" = 'New Jersey Saints' AND "Date" = 'February 21, 1988';