Non-alphanumeric character counts for Subversion source code:

     total      % of all chars   % of all non-alphanumerics
     -------    --------------   --------------------------
_    1106486    1.966361%        21.410370%
#    366233     0.650841%        7.086564%
.    340650     0.605377%        6.591536%
,    245931     0.437050%        4.758735%
"    241199     0.428640%        4.667171%
'    208449     0.370439%        4.033463%
-    207985     0.369615%        4.024485%
/    204402     0.363247%        3.955154%
(    201548     0.358176%        3.899929%
*    185905     0.330376%        3.597239%
:    173172     0.307748%        3.350857%
)    171109     0.304082%        3.310938%
=    170783     0.303502%        3.304630%
;    158271     0.281267%        3.062525%
%    124677     0.221566%        2.412485%
&    95775      0.170204%        1.853235%
$    94651      0.168206%        1.831485%
@    91562      0.162717%        1.771714%
!    72754      0.129293%        1.407781%
>    72238      0.128376%        1.397797%
]    70911      0.126018%        1.372119%
[    69448      0.123418%        1.343810%
\    65527      0.116450%        1.267940%
}    63147      0.112220%        1.221887%
+    61516      0.109321%        1.190327%
<    57957      0.102997%        1.121461%
^    52729      0.093706%        1.020300%
`    51850      0.092144%        1.003291%
{    39762      0.070662%        0.769390%
?    39463      0.070131%        0.763604%
~    30954      0.055009%        0.598956%
|    30947      0.054997%        0.598821%