Why does Squealer provide lists of figures, " which in variably demonstrated that everything was getting better and better. The animals found the problem insoluble;in any case, they had little time for speculation on such things"

"Better and better" could be seen as sarcasm because it was totally untrue in the case of the animals.

Squealer's figures only serve to confuse the other animals and end any curiosity they might have based on the fact that they don't understand it anyway. Throwing this type of propaganda at them would stop their questions.