18 = 10cm
19 = 10,5
20 = 11cm
21 = 11,3cm
22 = 11,5cm
23 = 12cm
24 = 12,3cm
25 = 12,5cm
26 = 12,8cm
27 = 13,3cm
28 = 13,8cm
29 = 14,3cm