Interesting that when viewed in statistical context, the numbers are so poor. Two reasons I say this:
1. I would seriously bet my car that they inflate the figures and manipulate the criteria for the data they track - but they probably have adhere somewhat to reality - i.e., 5% inflation over reality, but not 25%
2. They used to point to service increases of any kind as implied credibility - "this has to be God's organization to be growing this much."