Maybe someone can share some Chart Suggestions

Does anyone capture in a chart data that shows inbox volumes if so what way do you do it, sorry if i'm abit vauge if more info is needed please let me know.

Anything shared will be appreciated, if on a regualr basis you create a chart to show the volumes of incomming e-mails how have you grown to do this?

Did you start off one way and now do it another?

Once again sorry for the vaugness it is intentional as i'm not trying to influence the replies i'm just looking for YOUR ideas & ways you do this.