A running total tells how much has piled up; a rate tells how fast it changes....

https://tiny-wiki.win/index.php/What_Is_the_Best_Way_to_Compare_Two_Reports_That_Use_Different_Time_Scales%3F

A running total tells how much has piled up; a rate tells how fast it changes. With parcels, see why 30 boxes by noon is not the same as 5 boxes per hour. The article tracks units and time windows, so charts make sense at work.