remember, this is baptisms growth, this is "publisher" growth which includes unbaptized publishers.
In the western world, only about 0.2% - 0.5% of the attendance are getting baptised. If you take another 0.02% for 2 more assemblys during the year, you have a 0.6% - 0.9% growth over the year.
This figure doesn't show the amount of people leaving (dying, dfd, falling off the radar etc).
In an average cong of about 100 in the western world, i would imagine in a year, that at least 1 elderly person will die, and perhaps 1 will get dfd or fall off the radar. That is 2% of the congregation disappearing in a year.
Of course, you have to account for "young ones" getting to be unbaptized pubs.
But if your looking at baptized publishers, the WT has a serious problem.
Another side point, worldwide population growth is 1.14%. So if you use the figure of 0.9% getting baptized each year in developed lands, the WT is actually in decline already.
Numbers can lie.