It will actually only go to 92. A vitamin can only take a certain stat up to 100 EV's, so 10+92=102, exceeding the limit you can reach by using vitamins. This applies for all stats like Def, SDef, etc. Your best bet when using vitamins is to use ten first to reach 100 EV's, and then EV train the rest of the way by fighting pokemon. Hope this helps!