Two points to make here
Who is giving you those statistics? You would be surprised that the sources are Muslim fabrication, and that has been revealed recently.
And then again, have you ever wondered why e.g. Indonesia has had difficulties in making any statistics, could it be that Islam has declined incredibly and Christians increased with a speeding rate.
As to you convert stories, there are two further points:
Did you notices that maybe one or maybe none of those who mentioned were evangelical born again believers.
And even though they were, the Bible clearly states that such have never known the truth in the first place; which means there are no converts from real Christianity.