Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_22 (year_joined INTEGER, year_left INTEGER)
### Question:
Of all the schools that left before 2003, what is the average year joined?
### Answer:
SELECT AVG(year_joined) FROM table_name_22 WHERE year_left < 2003