Bandwidth Monitoring Display Application On a Mac?

I cannot find a neat Mac OS X equivalent to the Task Manager's "Network Utilization" graph in Windows as shown in the video at “PART 4 - Bandwidth Basics”. I really like the way it shows bandwidth as a percentage of the speed of the network interface. On Mac, the Activity Monitor simply shows how much data is being up/downloaded but doesn't show it as a percentage of the speed of the network interface. I've searched for third party tools but still haven't found one. Are you aware of any such tool for Mac OS X? Thanks for your help.

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