If it's of any use, the letter count is as follows:
A - 13 N - 88
B - 31 O - 16
C - 43 P - 31
D - 28 Q - 0
E - 133 R - 72
F - 9 S - 99
G - 2 T - 43
H - 6 U - 13
I - 7 V - 2
J - 0 W - 15
K - 9 X - 12
L - 51 Y - 2
M - 29 Z - 0
Notwithstanding vowels, that looks about in proportion for everyday English to me.