Players who have already earned a Mark of Excellence can track their progress towards the next one with the addition of progress percentages.
The progress will be shown in the Stats Log, per vehicle: «Your current ratio is higher than the ratio of X% of players».
At the moment, only players that have already earned a Mark of Excellence will be able to see the progress towards the next one. Players without a Mark on any tank will not be able to see their percentage while they try to earn the first Mark. This will be changed in a future update to allow all players to view their progress percentage even if they do not currently own a Mark.