CREATE TABLE table_76191 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Attendance" FLOAT)

What is the average Attendance, when the Date is September 17, 1981?
SELECT AVG("Attendance") FROM table_76191 WHERE "Date" = 'september 17, 1981'
SELECT AVG("Attendance") FROM "table_76191" WHERE "Date" = 'september 17, 1981'