CREATE TABLE table_34412 ("Game" FLOAT, "December" FLOAT, "Opponent" TEXT, "Score" TEXT, "Record" TEXT, "Points" FLOAT)

Which December has a Record of 21 6 5?
SELECT AVG("December") FROM table_34412 WHERE "Record" = '21–6–5'
SELECT AVG("December") FROM "table_34412" WHERE "Record" = '21–6–5'