How many clubs were founded in the westfalenstadion stadium?
CREATE TABLE table_26218124_1 (founded VARCHAR, stadium VARCHAR)
SELECT COUNT(founded) FROM table_26218124_1 WHERE stadium = "Westfalenstadion"
### Context: CREATE TABLE table_26218124_1 (founded VARCHAR, stadium VARCHAR) ### Question: How many clubs were founded in the westfalenstadion stadium? ### Answer: SELECT COUNT(founded) FROM table_26218124_1 WHERE stadium = "Westfalenstadion"