Bandwidth Usage Monitoring

I’m curious if there’s a way to see how much data is being transferred in and out of my home network at the router. My PC is connected via Ethernet and I don’t want to use a program that parses and displays each packet since there are other users on the network and I’d like to respect their privacy.

Essentially I’d just like to see a graph and table with how much data was flowing in/out over time. I have an ASUS RT-N66R (same as N66U model).