Non-alphanumeric character counts for Emacs src/ subdirectory:

     total      % of all chars   % of all non-alphanumerics
     -------    --------------   --------------------------
/    1454587    1.093844%        11.697673%
#    1106517    0.832097%        8.898522%
_    1031578    0.775743%        8.295868%
-    656569     0.493737%        5.280076%
.    609257     0.458159%        4.899596%
)    598780     0.450280%        4.815341%
$    590885     0.444343%        4.751850%
(    501716     0.377288%        4.034760%
@    467719     0.351723%        3.761359%
;    431134     0.324211%        3.467145%
!    427882     0.321766%        3.440993%
,    354427     0.266528%        2.850274%
:    337237     0.253601%        2.712033%
*    337202     0.253575%        2.711752%
<    283381     0.213101%        2.278927%
=    281891     0.211981%        2.266945%
'    251878     0.189411%        2.025583%
]    245430     0.184562%        1.973728%
%    231117     0.173799%        1.858624%
"    203618     0.153120%        1.637480%
`    203548     0.153067%        1.636917%
>    201555     0.151569%        1.620889%
&    198488     0.149262%        1.596225%
\    194343     0.146145%        1.562891%
}    185156     0.139237%        1.489010%
+    182949     0.137577%        1.471261%
?    175444     0.131933%        1.410907%
~    157484     0.118427%        1.266474%
|    147016     0.110555%        1.182291%
[    141388     0.106323%        1.137031%
^    136108     0.102353%        1.094570%
{    108557     0.081634%        0.873007%