user: Question: What's the average laps driven by David Coulthard?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Heinz-Harald Frentzen', 'Jordan - Mugen-Honda', 53.0, '1:17:02.923', 2.0]
SQL:

assistant: SELECT AVG("Laps") FROM "Table" WHERE "Driver" = 'David Coulthard';