That's hollow wordplay based on a misleading mathematical phenomenon. It's like a 21 year old man telling his 40 year old parent that their age difference has "decreased" on grounds that in terms of percentage, it used to be of 1900% when he was one year of age whilst now it amounts to less than 100%. In reality, their age difference is and will always remain stable at 19 years.
So what you're clinging to in despair is called sophistry, intellectual dishonesty and deliberate semantic manipulation. In this case they can be summarized as trolling, the kind of which only an extremely low IQ person may fall for.
Here's the fact: a government like the Islamic Republic, which improves literacy by 47 percentage points in 44 years, does so at a more rapid pace than one like the Pahlavi regime which merely improved it by 35 points over 58 long years. I know this is very hard to digest for those who try to whitewash an ousted vassal regime of the Americans and the zionists, and who're bent on denying the internationally recognized success of the Islamic Republic (and that includes closet-monarchist reformists), but no amount of trolling will change historic reality.
It also follows that Hack-Hook prefers Iran's literacy rate to rise by only 35 percentage points rather than by 47. Which says a lot about Hack-Hook's agenda - behold everyone. Maybe because the party this user is encouraging you to vote for, is promoted by people who openly claim that "Jewish culture is superior" to Iranian civilization. We're dealing with inverted racists and neo-colonialized compradors. Don't be complicit.