user: Question: What was the average attendance when the record was 17-18?
Columns: ['Date', 'Opponent', 'Score', 'Loss', 'Attendance', 'Record']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['May 1', '@ Mariners', '9 - 3', 'Moyer (1-4)', 35628.0, '14-11']
SQL:

assistant: SELECT AVG("Attendance") FROM "Table" WHERE "Record" = '17-18';