The last bar there is sell through rate lol. So the different icons show how much/fast it is selling through it's shipments I suppose.
EDIT: Here is an explanation - http://www.famitsu.com/game/rank/2000/12/28/index.html
So walking with the dotted line = 0-50% sell through. Walking faster = 51-75%. Running = 76-100%.
I think it would be more useful to remove the icons and just put those figures.







