This is what i found in the list:
0.00015 is around 35% per month, 0.00025 is around 30% per month, etc.
But as you can see, with the "getdifficulty" command it is around 0.0016 now. That means almost no % :-s
That's why I asked, because or I use the wrong command, ar we are far from the previous 40% we had.