I'm sorry but these numbers are entirely fallacious. You CANNOT get the number of people leaving simply by subtracting the number of baptisms by the number of publishers.
Why? Because baptised people are ALREADY counted as publishers. The number of people baptised says nothing about the number of new publishers. We would have to know the number of new publishers and then subtract that by the total number of publishers to figure out how many people are leaving. But we simply don't have those numbers.
For example, imagine if there were a year where a 100,000 people were baptised and not a single person left. What kind of growth in publishers would we expect to see?
Well, the answer is we wouldn't know. Because zero people could become new publishers and the number of people baptized could still be positive.