@The:
I disagree. With so few numbers, a lot of powers would be on top of each other, which is always annoying to me when changing income and such.
Which is why I suggest using 3 charts. Though I suppose the minor powers chart would have all 4 of them having 1 roundel on the 10 space. :| However, you still have powers overlapping with a typical chart anyway. You could always group the powers differently so as to avoid extra overlap. Such as Axis (Germany, Italy, Japan), Allies 1 (UKE, UKP, USA, France), and Allies 2 (USSR, China, ANZAC). That way you would only have at most 2 minor powers that would have the likely possibility of overlapping, plus each chart has a power that is likely to go below 10 relatively quickly (France and China) decreasing the amount of overlap further.
Perhaps this makes it overly complicated, but it’s what I came up with for making the chart go to 100 without increasing the size.
Alternately it could be 4 rows with 5 columns each, 3 charts. Then it would be the same width as previously, but you gain a row for NOs.
Axis Allies 1 Allies 2
0 4 8 30 70 0 4 8 30 70 0 4 8 30 70
1 5 9 40 80 1 5 9 40 80 1 5 9 40 80
2 6 10 50 90 2 6 10 50 90 2 6 10 50 90
3 7 20 60 100 3 7 20 60 100 3 7 20 60 100