user: Question: How many laps were there in grid 21?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Michael Schumacher', 'Benetton - Renault', '71', '1:38:34.154', '2']
SQL:

assistant: SELECT "Laps" FROM "Table" WHERE "Grid" = '21';