factfinder - I hear what you're saying, and I agree with you to an extent. You must be aware that these figures are only approximate, and based on monthly averages in the first place. They're intended to give an idea of the amount of publishers leaving the organization in each country.
It would be nice if the Society could publish the exact number of baptized and unbaptized publishers. For some reason, it doesn't do this. From what I can gather, it aggregates the sum of baptized publishers and unbaptized publishers as you suggest. However, the "baptisms" statistic still gives us a useful indicator of the number of new adherents being attracted on a yearly basis. Remove that figure from the yearly surplus, and what you have is a "rough idea" of the minimum number of people that have left. The true figures may be much higher once new unbaptized publishers have been accounted for. The fact is, we can never know.
It amazes me that some countries post massive growth even when you subtract the number of baptisms. For example, Mexico would have grown by 7,560 publishers even if you took away their baptism figures! These are obviously new unbaptized ones reporting, but it just goes to show that it swings both ways, and some countries ARE experiencing impressive growth.
Cedars