See Data Usage of Programs and Apps
Data usage tracking features have also been included on the updated Task Manager, which you can still open via the Ctrl + Shift + Esc keyboard shortcut. There you can view current network usage among the running processes and view a history of usage as well.
Sorting running processes by network usage.
Sorting app history by network usage.
These are useful if you’d like to track down network hungry apps that are using too much of your data plan, or maybe even to help reduce your network load.