Peak Publisher Inc/Dec by year - This charts the difference of the year's publishers compared to last years. So if there were 7,900,000 publishers in Year 1 and 8,100,000 publishers in Year 2, the number charted would be 200,000.
Same for the other charts, just using the reported Average Publisher, Baptism & Congregation data.
Charting this info is useful for showing growth trends over time.