user: Question: What is the average crowd size for an away team with a score of 13.12 (90)?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Essendon', '13.12 (90)', 'Hawthorn', '21.20 (146)', 'Windy Hill', 23244.0, '16 June 1975']
SQL:

assistant: SELECT AVG("Crowd") FROM "Table" WHERE "Away team score" = '13.12 (90)';