How many clubs were founded in the westfalenstadion stadium?
CREATE TABLE table_28441 (
    "Name" text,
    "Original Club" text,
    "Stadium" text,
    "City" text,
    "Country" text,
    "Sport" text,
    "Founded" real,
    "Reason for foundation with source" text
)
SELECT COUNT("Founded") FROM table_28441 WHERE "Stadium" = 'Westfalenstadion'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many clubs were founded in the westfalenstadion stadium? ### Input: CREATE TABLE table_28441 (
    "Name" text,
    "Original Club" text,
    "Stadium" text,
    "City" text,
    "Country" text,
    "Sport" text,
    "Founded" real,
    "Reason for foundation with source" text
) ### Response: SELECT COUNT("Founded") FROM table_28441 WHERE "Stadium" = 'Westfalenstadion'