size	number	percentage
18	82	1.78
19	90	1.95
20	177	3.84
21	390	8.46
22	458	9.93
23	787	17.07
24	1149	24.92
25	1034	22.43
26	355	7.70
27	56	1.21
28	28	0.61
29	4	0.09
