The newest addition to the charts is the Skillradar. It shows in a radar like chart how well you are performing vs. the other. The more the radar is filled, the better you are.
There are Skillradars for overall performance, by tank type and for each tank. Values are calculated for Accuracy, Damage Dealt, Damage Assisted, Survived, Winrate and WN7 Efficiency.
Skillradar is regenerated once a day.