我统计的声母和韵母的频率

# shen
a    0.404%
b    4.195%
c    1.309%
d    8.914%
e    0.426%
f    3.054%
g    5.286%
h    4.939%
i    3.132%
j    7.681%
k    2.021%
l    4.845%
m    2.854%
n    2.186%
o    0.093%
p    1.458%
q    3.147%
r    2.242%
s    1.604%
t    3.361%
u    7.332%
v    6.454%
w    3.959%
x    6.359%
y    9.426%
z    3.319%
# yun
in    2.807%
ang    3.698%
iu    0.953%
eng    3.077%
a    2.915%
ing    3.965%
e    9.221%
ian    4.355%
iao    1.814%
ong    4.645%
i    15.872%
uai    0.160%
o    0.867%
uan    3.124%
ei    2.762%
u    8.970%
uang    0.698%
v    0.294%
ou    3.428%
en    3.485%
ua    0.624%
er    0.372%
ue    1.110%
ui    1.882%
un    1.039%
uo    2.997%
iang    1.537%
ia    1.089%
ai    3.367%
ie    1.321%
an    4.251%
ao    3.263%
iong    0.036%

图片：註音符号使用频率.gif

类似主题的台湾方面的统计数据。年代可能有点酒。不过，注音符号中 y与i  w与u  ü与yu/v/(jqx-)u  都不作区分。

这个有参考价值。辛苦了！