user: ### NOW ANSWER:
Question: How many foundeds have stade tunisien as the club, with a capacity greater than 18000?
Columns: ['Club', 'City', 'Founded', 'Stadium', 'Capacity']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Étoile Sportive du Sahel', 'Sousse', 1925.0, 'Stade Olympique de Sousse', 25000.0]
SQL:

assistant: SELECT SUM("Founded") FROM "Table" WHERE "Club" = 'stade tunisien' AND "Capacity" > 18000.0;