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_17 (year_opened INTEGER, track_name VARCHAR, seating VARCHAR)
### Question:
What is the year opened for Chicagoland Speedway with a seating smaller than 75,000?
### Answer:
SELECT AVG(year_opened) FROM table_name_17 WHERE track_name = "chicagoland speedway" AND seating < 75 OFFSET 000