What is the average capacity of the stadiums that were opened in year 2005?
CREATE TABLE stadium (
    capacity INTEGER,
    opening_year VARCHAR
)
SELECT AVG(capacity) FROM stadium WHERE opening_year = 2005
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: What is the average capacity of the stadiums that were opened in year 2005? ### Input: CREATE TABLE stadium (
    capacity INTEGER,
    opening_year VARCHAR
) ### Response: SELECT AVG(capacity) FROM stadium WHERE opening_year = 2005