CREATE TABLE table_31790 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Attendance" FLOAT)

What was the total attendance on December 14, 1975 after week 13?
SELECT COUNT("Attendance") FROM table_31790 WHERE "Date" = 'december 14, 1975' AND "Week" > '13'
SELECT COUNT("Attendance") FROM "table_31790" WHERE "Date" = 'december 14, 1975' AND "Week" > '13'