Question: What is the seating capacity of the stadium as of 2015 in which 1971 Oklahoma Sooners football team payed their home games?
Sentence (from "1984 Oklahoma Sooners football team"): Oklahoma Sooners football participated in the former Big Eight Conference at that time and played its home games in Gaylord Family Oklahoma Memorial Stadium where it has played its home games since 1923.
Relevant evidence: No