user: ### NOW ANSWER:
Question: What is the year opened for chicagoland speedway with a seating smaller than 75000?
Columns: ['Track Name', 'Location', 'Length', 'Seating', 'Year Opened', 'Year Acquired [A ]']
Types: ['text', 'text', 'text', 'real', 'real', 'real']
Sample row: ['Auto Club Speedway', 'Fontana, CA', 'miles (km)', 92000.0, 1997.0, 1999.0]
SQL:

assistant: SELECT AVG("Year Opened") FROM "Table" WHERE "Track Name" = 'chicagoland speedway' AND "Seating" < 75000.0;