user: Question: Which team has an away score of 15.9 (99)?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Hawthorn', '12.13 (85)', 'North Melbourne', '10.10 (70)', 'Glenferrie Oval', 12380.0, '23 June 1973']
SQL:

assistant: SELECT "Away team" FROM "Table" WHERE "Away team score" = '15.9 (99)';