I tested an old list of mine recently and I cehcked the stats.
Something is wrong, a detail but wrong.
Page : admin/?page=statsoverview
The first four columns are : campaign / date / sent / rejected
In my stats I have 188 sent and 132 rejected, and into the bracket I have 70.21% (rejected)
But in fact I have 132 rejected on 320 sent and not 188, so the %age of rejected is 132/320 => 41.25%
So the right formula should be [(rejected)/(rejected + sent)] * 100
Really a detail, but can be fixed easily.