>>44660110this can be skewed by the number of evo stages the pokemon have. lets say one game add 10 fully evolved pokemon with 3 stages each then you would get +30 pokemon out of the toal number, while lets say another game adds 15 fully evolved pokemon with 2 stages each it would also count as +30 new pokemon out of the total number, while actually offering more fully evolved pokemon.
I doubt that the influence of that is significant, but if you make a chart like this you should only count fully evolved pokemon and don't use the total number of pokemon in the percentages.