FRM Frequency Survey

It is plain to see that starting with channel 30 the higher channels are more populated. I believe this to be due to the fact that in the beginning of the narrow band (1971) that lower channels were distributed on the East coast and the higher channels on the West coast.
Channel	Users
11	5
12	3
13	5
14	4
15	5
16	5
17	2
18	4
19	4
20	7
21	3
22	4
23	6
24	8
25	3
26	4
27	4
28	5
29	2
30	9
31	2
32	7
33	3
34	12
35	3
36	6
37	2
38	2
39	2
40	8
41	2
42	12
43	2
44	7
45	6
46	6
47	3
48	7
49	2
50	8
51	1
52	6
53	5
54	9
55	7
56	10
57	8
58	4
59	4
60	5