CREATE TABLE table_71747 ("Year" FLOAT, "Opponent" CLOB, "Competition" CLOB, "Score" CLOB, "Venue" CLOB, "Attendance" CLOB)

What year was the average attendance 80,388?
SELECT AVG("Year") FROM table_71747 WHERE "Attendance" = '80,388'
SELECT AVG("Year") FROM "table_71747" WHERE "Attendance" = '80,388'