user: Question: What is the average number of laps when Gerhard Berger is the driver?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Johnny Herbert', 'Benetton - Renault', 53.0, '1:18:27.916', 8.0]
SQL:

assistant: SELECT AVG("Laps") FROM "Table" WHERE "Driver" = 'Gerhard Berger';