Plotting Share (Stock) Volumes

I am trying to plot share trade volumes in a meaningful way, such that exceptions stand out. My problem is that the volume can vary in magnitude on a day to day basis. For example, 800,000 one day 91,000,000 the next. Also, due to special transactions the highest volume may be, for example, 330 million whereas normally it is 1 million. If you plot on a normal scale the abnormal swamps the normal, plot it on a log scale the abnormal does not stand out.

Any suggestions or examples?