CREATE TABLE table_203_145 (id DECIMAL, "position" DECIMAL, "club" TEXT, "played" DECIMAL, "points" TEXT, "wins" DECIMAL, "draws" DECIMAL, "losses" DECIMAL, "goals for" DECIMAL, "goals against" DECIMAL, "goal difference" DECIMAL)

what is the average number of goals for of the top 5 teams ?
SELECT AVG("goals for") FROM table_203_145 WHERE "position" <= 5
SELECT AVG("goals for") FROM "table_203_145" WHERE "position" <= 5