user: Question: What is the average attendance when the Forest Green Rovers is the away team?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['1', 'Oxford United', '0 – 0', 'Southend United', 5163.0]
SQL:

assistant: SELECT AVG("Attendance") FROM "Table" WHERE "Away team" = 'Forest Green Rovers';