user: Question: How many drivers won the Italian Grand Prix?
Columns: ['Round', 'Grand Prix', 'Pole Position', 'Fastest Lap', 'Winning Driver', 'Winning Constructor', 'Report']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Australian Grand Prix', 'Mika Häkkinen', 'Rubens Barrichello', 'Michael Schumacher', 'Ferrari', 'Report']
SQL:

assistant: SELECT COUNT("Winning Driver") FROM "Table" WHERE "Grand Prix" = 'Italian Grand Prix';