Since starting to collect the monster about 5 years ago, I've wanted to know the general population of each back relative to a 524 card set. I'd like the composition of my monster to reflect the relative percentage of backs that exist.
I cobbed together some rough numbers a couple of years ago using Scot Reader's data and Bill Brown's superset spreadsheet. Thank you both Scot and Bill by the way for all your effort and willingness to share! I am currently using those rough numbers as guideline for my set.
I tried to get a more definitive answer from the t206resource guys around that same time when they were rolling out their website, but the general response was that there are too many variables to determine the "relative % of each back per 524 cards". I can see why that may be true, it's certainly true if I try to do it myself

, I was just a tad surprised. I wasn't and still am not versed enough to question if it is actually possible or not. I just suspect that a good estimate can be made.
Anyway, here is the list of relative back population which I am using:
- back (target number of each back per 524)
- p150 (54-62)
- p350-460 25 (24-27)
- p350 (153-168)
- p350-460 42 (1-2)
- sc350-460 42 (3)
- sc150 25 (7-8)
- sc350-460 30 (9-10)
- sc150 30 (25)
- sc350 25 (11-16)
- sc350 30 (61-65)
- sc150 649 op (6-9)
- sc350-460 25 (2-3)
- sc350-460 42 op (6-10)
- sov150 (8-11)
- sov350 (19-22)
- sov460 (4-6)
- pb (26)
- om (9)
- epdg (5-8)
- tolstoi (6-8)
- cyc350 (5-6)
- cyc460 (1-3)
- ab350 nf (1-4)
- ab350 wf (3-11)
- ab460 (1-4)
- hindu brown (3-7)
- cb (1-3)
- bl350 (1-2)
- hindu red (1)
- lenox black (1)
- drum (1)
- uzit (1)
- lenox brown (1)
- bl460 (1)
All those (1)'s are really a very small percentage, but I rounded up to (1) since I'd need 1 of each in my set to represent the back distribution. I doubt I'll ever have any of those small (number) backs - if I have to pay market price for them that is!.