17 18 18.5 19 19.5 20 20.5 21 22 22.5 23 23.5 24 24.5 25 25.5 26 27 27.5 28 28.5 29 29.5 30 30.5 31 31.5 32 32.5 33 33.5 34 34.5 35 36 37 37.5 38 39 40 22-23 23-24 24-25 25-26 27-28 28-29 29-30 30-31 32-33 33-34 34-35